Donald Trump appeared to ignore the demands of British rocker Paul Rodgers by using his hit All Right Now at the end of his Republican nomination speech.
The artist, who wrote the tune in 1970 while a member of Free, previously warned the US presidential candidate that he had alerted his lawyer to the song's unauthorised use during the Republican convention in Cleveland, Ohio.
Mr Trump accepted his party's nomination in a fiery speech, ending with his campaign slogan "make America great again" and "I love you" before the song's famous guitar riff kicked in.
Rodgers made it clear that Mr Trump's use of the song, written with Free member Andy Fraser, was unauthorised in a tweet posted on Monday.
He wrote: "Permission to use "All Right Now" was never sought for or granted by me. My lawyer is dealing with this matter - Paul."