GOP presidential nominee Donald Trump has said he is planning to sue the women who accused him of groping or kissing them without consent.

A number of women have accused the Republican of making unwanted sexual advances, which Trump has denied.

"Every woman lied when they came forward to hurt my campaign," CNN reported Trump during a speech in Gettysburg, Pennsylvania, in which he also laid out a 100-day plan for the future.

"Total fabrication. The events never happened. Never. All of these liars will be sued after the election is over," he added of the allegations made against him.

Trump has previously denied the claims and has stated on several occasions he believes the allegations have come from Clinton's campaign team, an accusation he reiterated once again in Gettysburg.

"It was probably the (Democratic National Committee) and Hillary's campaign who put forward these liars with their fabricated stories," he said. "But we'll probably find out later through litigation, which we're so looking forward to."

Trump has suggested any legal action – if indeed he moves forward with it – would take place after the election.

However, his suggestion of suing the women was criticised by his opponent, whose campaign spokesperson Christina Reynolds told CNN in a statement: "Today, in what was billed as a major closing argument speech, Trump's major new policy was to promise political and legal retribution against the women who have accused him of groping them.

"Like Trump's campaign, this speech gave us a troubling view as to what a Trump State of the Union would sound like—rambling, unfocused, full of conspiracy theories and attacks on the media, and lacking in any real answers for American families."