Irish Foreign Minister Simon Coveney has warned there will be no EU-UK trade agreement if Boris Johnson pushes ahead with legislation that would allow Britain to break international law.
As Brexit negotiations come down to the wire, Mr Coveney again expressed concern at the Internal Market Bill being championed by the Prime Minister in Parliament.
Downing Street has insisted it will press on in the Commons with elements of the proposed legislation that would allow the Government to break international law despite the House of Lords voting against them in recent days.
The move comes as London and Brussels are set to continue talks this week ahead of the Brexit transition period coming to a close at the end of the year.
Pictures of the week: November 8 - 14
Pictures of the week: November 8 - 14
Vinegar Strokes and Courtney Act take part a photocall for Death Drop: A Dragatha Christie Murder Mystery at the Garrick Theatre in London. (Photo by Brett Cove / SOPA Images/Sipa USA)
A view of the Covent Garden?s Infinity Chamber that encourages visitors to take five minutes out of their busy day and indulge in restorative colour therapy. Created using thousands of LED bulbs which will change colours throughout the day from beautiful bright white to an ever changing rainbow. The Infinity Chamber is free for visitors to use 24 hours a day, making it the first of its kind in London . (Photo by Keith Mayhew / SOPA Images/Sipa USA)
A man cleans windows above The North Face store in London?s Covent Garden while abseiling down the side. (Photo by Dave Rushen / SOPA Images/Sipa USA)
Scotland's David Marshall saving from Serbia's Aleksandar Mitrovic to win the penalty shoot and qualifying for the Euro2020 finals following the UEFA Euro 2020 Play-off Finals match at Rajko Mitic Stadium, Belgrade.
Residents and care workers at Churchview Nursing Home in Liverpool watch a video of this year's christmas lights switch on in Liverpool city centre. The video was created for people isolating at home, in care homes or for those who are unable to get into the city centre due to the current coronavirus lockdown in England. (Photo by Peter Byrne/PA Images via Getty Images)
A Westminster council worker sweeps up fallen leaves in the Aldwych in London. (Photo by Dave Rushen / SOPA Images/Sipa USA)
GREAT MISSENDEN , ENGLAND - NOVEMBER 11: HS2 contractors at the site of tree felling at a section of an Iron Age earthwork known as Grim's Ditch, scheduled as an 'Ancient Monument', that will be destroyed by the HS2 High Speed Rail line, on November 11, 2020 in Great Missenden, England. ‘Scheduling’ gives an archaeological site the highest level of protection that the state can give, but the HS2 Hybrid Bill allows previous protective legislation to be set aside and this 120-metre section of Grim's Ditch will be destroyed. Much of the countryside around the surrounding Misbourne Valley and Aylesbury Vale is also under threat from the controversial HS2 project. HS2 protesters continue to occupy key infrastructure sites along the proposed HS2 route claiming that the project is "the most carbon-intensive and environmentally destructive project in UK history." (Photo by Jim Dyson/Getty Images)
Britain's Camilla Duchess of Cornwall leaves after attending the Armistice Day service at Westminster Abbey in London, Wednesday, Nov. 11, 2020. The specially arranged service, with social distancing because of the coronavirus, commemorates the 102nd anniversary of the armistice ending World War I, and one hundred years since the symbolic interment of the Unknown Warrior at Westminster Abbey. (Aaron Chown/Pool via AP)
LONDON, UNITED KINGDOM - NOVEMBER 11: Police officers cordon off the area after a car crashed to the police station in London, United Kingdom on November 11, 2020. (Photo by Bilal Acar/Anadolu Agency via Getty Images)
A giant poppy seen at King's Cross station. The poppy displayed at the station for Remembrance Day / Armistice day, it is commemorated every year on 11th November. (Photo by Vuk Valcic / SOPA Images/Sipa USA)
Britain's Prime Minister Boris Johnson, and Chancellor Rishi Sunak during a visit to a tesco.com distribution centre in London, Wednesday, Nov. 11, 2020. (AP Photo/Kirsty Wigglesworth, pool)
Pro EU supporters argue with Brexit supporters in London, Wednesday, Nov. 11, 2020. Negotiations continue on London between the EU bloc and British officials to agree A Brexit deal as Britain is due to split from Europe from January 1. (AP Photo/Frank Augstein)
The Cenotaph in London's Whitehall is being surrounded by wreathes of poppies laid there by the royal family and others in honour of Remembrance Day. (Photo by Brett Cove / SOPA Images/Sipa USA)
Jockey Paul O'Brien is unseated by Nightline in the tote.co.uk Ten To Follow Conditional Jockeys' Veterans' Handicap Chase (Series Qualifier) at Huntingdon Racecourse.
A huge construction machine at Dawlish train station where work has begun building a new and bigger sea wall to protect the railway and town from rising sea levels using an eight-legged, self-contained walking jack-up barge, known as a Wavewalker � the only one of its kind in Europe. It is the first time this type of barge has been used to maintain the UK rail network and the machine is able to operate across high tidal ranges, which particularly impact the south Devon coastline.
Cruise boats seen moored on the River Thames next to Lambeth Palace.
The River Thames has seen a huge reduction in traffic due to the ongoing pandemic. (Photo by Dave Rushen / SOPA Images/Sipa USA)
A general view of a Christmas decoration that says '2020 The Year of Lockdown', as the UK heads into the festive period in lockdown due to the coronavirus pandemic.
Shoppers queue to enter shops in Cardiff, Wales, Monday Nov. 9, 2020, after restrictions imposed by the Welsh government are relaxed following a two-week lockdown across Wales. (Ben Birchall/PA via AP)
People wearing face masks walking in the Covent Garden Market.
Most shops, restaurants and businesses have closed as the second month-long nationwide Covid 19 lockdown begins in England. (Photo by Vuk Valcic / SOPA Images/Sipa USA)
A woman passes a Virginia Creeper displaying autumnal colours, on the walls of the Old Admiralty Building, in London, Monday Nov, 9, 2020. (Dominic Lipinski/PA via AP)
Members of the military use Anfield stadium as part of the mass testing taking place in the city of Liverpool, as a pilot for mass testing in the city enters its second week. (Photo by Peter Byrne/PA Images via Getty Images)
The Forth Bridge is covered by fog in the Firth of Forth, South Queensferry. (Photo by Jane Barlow/PA Images via Getty Images)
Anti-Brexit protester Steve Bray holds placards outside the Conference Centre in London, Monday, Nov. 9, 2020, as the European Commission's Head of Task Force for Relations with the United Kingdom Michel Barnier takes part in Brexit talks inside. With less than two months to go before the U.K. exits the EU's economic orbit, trade deal talks resume in London on Monday. (AP Photo/Matt Dunham)
Britain's Chancellor of the Duchy of Lancaster, Michael Gove is surrounded by photographers as he gets in a car in London, Monday, Nov. 9, 2020. (AP Photo/Frank Augstein)
Police officers arrest a protester during the demonstration.
Protests all across the country have been seen this weekend challenging the latest lockdown that was imposed on the country earlier in the week. (Photo by Kenny Brown / SOPA Images/Sipa USA)
Veteran Charlie MacVicar, who served for 23 years with Royal Scots (Edinburgh Unit) pays his respects at the Royal British Legion Remembrance Garden, on Remembrance Sunday, in Grangemouth, Scotland, Sunday, Nov. 8, 2020. (Jane Barlow/PA via AP)
Britain's Queen Elizabeth II looks on from the balcony of the Foreign Office, during the Remembrance Sunday service at the Cenotaph, in Whitehall, London, Sunday Nov. 8, 2020. (Chris Jackson/Pool Photo via AP)
Seymour 'Bill' Taylor, 95, from Colchester, who served as an Able Seaman in the Royal Navy onboard HMS Emerald during the D-Day landings joins neighbours in the street to observe the two minutes silence to pay his respects on Remembrance Sunday, in Essex, England, Sunday, Nov. 8, 2020. (Joe Giddens/PA via AP)
Liverpool's manager Jurgen Klopp, left, and Manchester City's head coach Pep Guardiola greet each other at the end of the English Premier League soccer match between Manchester City and Liverpool at the Etihad stadium in Manchester, England, Sunday, Nov. 8, 2020. The game ended in a 1-1 draw. (Martin Rickett/Pool via AP)
EU chief negotiator Michel Barnier wearing a mask because of the novel coronavirus pandemic arrives at St Pancras Station in London on November 8, 2020 as work continues on a trade deal between the EU and the UK. - The European Union and Britain said on November 7 major divergences remain but that post-Brexit negotiations would continue next week to clinch a trade deal in the scant time left. (Photo by JUSTIN TALLIS / AFP) (Photo by JUSTIN TALLIS/AFP via Getty Images)
Discover More Like This
BACK TO SLIDE
Mr Coveney, who said things need to "move" this week, told Sky News: "Even if we do get a new trade deal negotiated by both sides, if the British Government is determined to continue with their Internal Market Bill – to reintroduce parts of that Bill that were removed by the House of Lords this week – then, I think this is a deal that won't be ratified by the EU.
"Because there is no way the EU will agree to ratify a new agreement if the British Government is breaking the existing agreement that is not even 12 months old, and breaking international law by doing that."
Mr Coveney also called for a cooling of rhetoric in trade talks, especially in the contentious area of fishing rights.
He said: "We really have to try and find a way of coming up with a compromise on fish that both sides can live with.
"And we need to try and dial down the language on this because it is very easy to become emotive."
Mr Coveney insisted a deal was "doable".
He said: "I think I would sum it up by saying this is very difficult, but, it's also very doable.
"And I think the consequences of not getting a trade deal and a future relationship deal... before the end of the year, I think is very significant."
Environment Secretary George Eustice said next week is "a week when things need to move" for the UK and EU to agree to a trade deal.
He said: "Both sides recognise that time is very, very short. It's not long ago we were saying we needed to get some kind of conclusion by the middle of October.
"People have persevered with these talks. There does come a point frankly where businesses need to know what they are preparing for."
He added: "You can always squeeze out extra time if you need to, if you're nearly there.
"But, I agree with Simon Coveney, perhaps we can agree on this much... this needs to be a week when things move, when we break through some of these difficult issues and get resolution and at least have some sort of headlines – if you like – of an agreement.
"Otherwise, it gets quite difficult and we do start to run out of time to implement it."