Story highlights Trump appeared on NBC News days after he fired former FBI Director James Comey

The firing came during an ongoing investigation into Russia's meddling into the 2016 election

Washington (CNN) President Donald Trump said Thursday he believes the idea that Russia meddled in the 2016 election is a "made-up story" that Democrats are using to explain away his victory.

"When I decided to just do it [fire former FBI Director James Comey], I said to myself, I said you know, this Russia thing -- with Trump and Russia -- is a made-up story," Trump told NBC News in an interview. "It's an excuse by the Democrats for having lost an election that they should have won."

He repeated that point Friday morning, tweeting: "Again, the story that there was collusion between the Russians & Trump campaign was fabricated by Dems as an excuse for losing the election."

Again, the story that there was collusion between the Russians & Trump campaign was fabricated by Dems as an excuse for losing the election. — Donald J. Trump (@realDonaldTrump) May 12, 2017

The President's remarks come despite widespread agreement among US intelligence officials and lawmakers from both sides of the aisle that Russia did indeed interfere in the US election.

US officials -- including prominent GOP lawmakers such as Sen. John McCain -- have said they were "troubled" by Trump's abrupt firing of Comey mid-investigation. Many Democratic lawmakers are calling for the appointment special prosecutor to take Comey's place in leading the investigation.

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