US PRESIDENT Donald Trump once again leapt to the defence of his latest Supreme Court nominee, Brett Kavanaugh, after learning of the collapse of an accuser’s story.

“A vicious accuser of Justice Kavanaugh has just admitted that she was lying, her story was totally made up, or FAKE!” he indignantly tweeted on Saturday morning (local time).

According to the New York Post, Republican Senator Chuck Grassley, who heads the Senate Judiciary Committee, asked the FBI on Friday to investigate Judy Munro-Leighton.

She had claimed that Mr Kavanaugh and a friend raped her “several times each” in the back seat of a car years ago.

The original accusation was made in a September 19 letter to Democrat Senator Kamala Harris.

A woman who identified herself as “Jane Doe” from Oceanside, California, detailed the episode in the car.

However, committee investigators discovered Ms Munro-Leighton is a “left-wing activist” who is “decades older than Kavanaugh”.

She admitted that she made the claim in anger because she opposed Mr Kavanaugh’s nomination.

Her accusation was one of many that came in the wake of Dr Christine Blasey Ford’s September 27 testimony, in which she emotionally recalled how Mr Kavanaugh had sexually assaulted her when they both were in high school — an account that nearly derailed his confirmation.

There is no suggestion Dr Blasey Ford’s testimony is false.

The Senate however went on to approve Mr Kavanaugh’s appointment to the Supreme Court days later.

The battle over Mr Kavanaugh invigorated Republican voters’ enthusiasm for Tuesday’s midterm elections — and Mr Trump has mentioned it frequently on the campaign trail.

Mr Trump is currently in the midst of a final sprint to Tuesday’s midterm elections, campaigning for Republicans to keep a majority hold of the senate.

The decision may come down to Floridians as they head to the voting box on Tuesday, when they decide whether to keep three-term incumbent Democrat Bill Nelson in office or replace him with Republican Govenor Rick Scott.

Mr Nelson has been viewed as one of the nation’s most vulnerable Democrats thanks to the formidable challenge from Mr Scott, a multi-millionaire businessman who has poured more than $60 million of his own fortune into the contest.

A Nelson loss could make it difficult for Democrats to take back the Senate.