Donald Trump vows to sue the women who have accused him of unwanted sexual behaviour

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Donald Trump has laid out an ambitious agenda for his first 100 days as US president, but his vow to sue the women who have accused him of unwanted sexual behaviour overshadowed the billionaire's "Gettysburg address".

"All of these liars will be sued once the election is over," the Republican said on Saturday during an event near the Civil War battlefield in Pennsylvania that was meant to be policy-driven. "I look so forward to doing that," he added.

In his 100-day plan, Trump said he would lift restrictions on domestic energy production, label China as a currency manipulator and renegotiate the North American Free Trade Agreement; all familiar themes to supporters who have flocked to his rallies this year.

"This is my pledge to you, and if we follow these steps, we will once again have a government of, by and for the people," Trump said, invoking a phrase from Abraham Lincoln's Gettysburg Address.

Though mostly a recap of policies he has proposed before, Trump's speech included a few new elements, such as a freeze on hiring new government workers and a two-year mandatory minimum sentence for immigrants who re-enter the US illegally after being deported a first time.

Days earlier, during the final debate, his otherwise well-received performance was marred by an alarming statement near the end that he might not accept the outcome of the election if he loses.

Donald Trump stands with vice presidential candidate Gov. Mike Pence
(Evan Vucci/AP)

With the debates over, Trump and Democrat rival Hillary Clinton have few apparent opportunities to alter the course the race substantially -- a reality that benefits Clinton more than Trump.

The Republican is trailing his opponent in polls in most of the battleground states while Clinton eyes potential upset victories in traditionally safe Republican territory, with Arizona at the top of the list.

On Saturday, an increasingly confident Clinton made what has become her closing pitch, stressing unity during events in Pittsburgh and Philadelphia and asking her backers to carry her message to any Trump supporters they met.

"I understand that they need a president who cares about them, will listen to them and I want to be their president," she said.