Donald Trump 'abruptly ended' an interview with premier US news magazine TV show 60 minutes - before attacking his interviewer on Twitter.
The President tweeted a video of host Lesley Stahl apparently not wearing a mask as the programme was being recorded.
Trump said there was "much more to come."
He later threatened to release his own video of the interview before it is due to air on Sunday, "so that everybody can get a glimpse of what a FAKE and BIASED interview is all about."
But later it was reported there had been "drama" during the taping of the programme.
CNN White House correspondent Kaitlan Collins tweeted that the President had ended his interview "abruptly" after around 45 minutes.
The President reportedly told programme makers had enough material, and he wouldn't continue with the recording.
And CNN reported Trump did not return for a scheduled "walk and talk" interview he was scheduled to do for the programme with Vice President Mike Pence.
According to CNN, Mr Pence recorded his segment alone.
Stahl revealed in May that she had been diagnosed with Covid-19.
She said the disease had left her bedridden for two weeks, fighting pneumonia.
"One of the rules of journalism is "Don't become part of the story," she wrote.
"But instead of covering the pandemic, I was one of the more-than-one million Americans who did become part of it."
Later, the President said he was "considering" publishing footage of the interview himself, before its intended airtime on Sunday.
He tweeted: "I am pleased to inform you that, for the sake of accuracy in reporting, I am considering posting my interview with Lesley Stahl of 60 Minutes, PRIOR TO AIRTIME!
"This will be done so that everybody can get a glimpse of what a FAKE and BIASED interview is all about..."
Frontrunner Joe Biden and VP candidate Kamala Harris were interviewed for the same programme yesterday at their campaign HQ in Delaware.
Trump campaign advisor Jason Miller said claims the President walked out of the interview were "very fake news."
He said: "No drama, interview was not ended abruptly and we have the receipts from the interview - all of them!
"Maybe we need to put the whole thing out so people can see for themselves?"
Earlier, Melania Trump cancelled a planned campaign appearance due to a lingering 'Covid cough'.
The First Lady was due to accompany President Donald Trump to a rally in Eyrie, Pennsylvania tonight.
It was to be her first public appearance since being diagnosed with Covid-19, three weeks ago.
And it would have been her first campaign trip with her husband since the Republican National Convention in August.
The first lady's Chief of Staff, Stephanie Grisham said the First Lady had decided not to go on the trip out of an abundance of caution.
National polls show former Vice President Biden holding a wide lead on Republican Trump, though the contest is closer in swing states that decide elections including Florida, North Carolina and Pennsylvania.
Trump has gained some ground on Biden in Pennsylvania, according to a Reuters/Ipsos poll released on Monday, which showed the challenger leading by 49% to 45%, slightly narrower than a week earlier.
