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WASHINGTON, DC - JUNE 08: Former FBI Director James Comey leaves a closed session with the Senate Intelligence Committee in the Hart Senate Office Building on Capitol Hill June 8, 2017 in Washington, DC. Comey said that President Donald Trump pressured him to drop the FBI's investigation into former National Security Advisor Michael Flynn and demanded Comey's loyalty during the one-on-one meetings he had with president. (Photo by Drew Angerer/Getty Images)
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WASHINGTON, DC - JANUARY 22: U.S. President Donald Trump (L) shakes hands with James Comey, director of the Federal Bureau of Investigation (FBI), during an Inaugural Law Enforcement Officers and First Responders Reception in the Blue Room of the White House on January 22, 2017 in Washington, DC. Trump today mocked protesters who gathered for large demonstrations across the U.S. and the world on Saturday to signal discontent with his leadership, but later offered a more conciliatory tone, saying he recognized such marches as a "hallmark of our democracy." (Photo by Andrew Harrer-Pool/Getty Images)
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Story highlights

Two weeks ago, President Donald Trump accused President Barack Obama of wiretapping him during the campaign

Those claims will be a part of a House Intelligence Committee hearing on Monday

(CNN) —  

The bizarre saga of President Donald Trump’s claims that he was wiretapped by President Barack Obama last year reaches a dramatic climax Monday with FBI Director James Comey’s testimony to the House Intelligence Committee.

It’s a moment of political theater that could end in humiliation for Trump, with Comey expected to say that there was no wiretapping, debunking allegations that Trump has repeatedly refused to withdraw.

The hearing could also shed light on the state of FBI investigations into the extent of Russian meddling in the election campaign. Republicans hope Comey will state that there is no evidence of collusion between Trump aides and officials from Moscow, a move that could begin to break up a cloud of Russian intrigue that has stifled the early weeks of the administration.

RELATED: Comey hearing under way before House Intelligence Committee

Trump was trying to shift attention away from the wiretapping claims in a series of Monday morning tweets.

“James Clapper and others stated that there is no evidence Potus colluded with Russia. This story is FAKE NEWS and everyone knows it!” Trump wrote shortly after 6:30 a.m. ET, followed by: “The Democrats made up and pushed the Russian story as an excuse for running a terrible campaign. Big advantage in Electoral College & lost!”

The controversy over the wiretapping claims was unleashed by stunning early morning tweets from the President at his Mar-a-Lago resort in Florida two weeks ago. He drew parallels to Watergate and McCarthyism and said Obama was a “Bad (or sick) guy!” for ordering surveillance of his New York residence – allegations the former president quickly denied through a spokesman.

In one sense, the strange controversy over Trump’s tweets has left the President in a position where he is most comfortable politically — at odds with the media and the political and intelligence establishment in Washington.

But it has also evolved into a political distraction at a time when Trump is facing fights over Obamacare repeal and the budget that will help define his first 100 days in office. This week, for example, the administration should benefit from favorable coverage of the confirmation hearings of Trump’s respected Supreme Court pick Neil Gorsuch, but the Intelligence Committee hearing has the capacity to overshadow the judge’s testimony.

RELATED: What Neil Gorsuch learned from Kennedy, Scalia and Thomas

Comey’s appearance will highlight the strange, starring role of the FBI director in an election that many Democrats believe was tilted toward Trump by Comey’s interventions related to Hillary Clinton’s use of a private email server. The FBI chief now finds himself presiding over a politically explosive investigation that could include the behavior of aides to the sitting President amid claims by Democrats of nefarious dealings between Trump’s campaign inner circle and Russian political and intelligence officials.

01:05 - Source: CNN
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Trump’s failure to provide evidence for his wiretapping accusation – effectively an allegation of criminal wrongdoing against the former administration – or to draw back the claims tied his White House in knots as it sought to explain and finesse the tweets while sparing the President embarrassment.

But the effort stumbled as every key congressional figure associated with intelligence oversight said there was no evidence of wiretapping. Comey was “incredulous” about Trump’s tweets, sources familiar with the matter told CNN.

The administration’s isolation was clear on the eve of the hearing Sunday.

“Was there a physical wiretap of Trump Tower? No … there never was,” Republican House Intelligence Committee Chairman Devin Nunes told “Fox News Sunday.”

The top Democrat on the committee, Rep. Adam Schiff, added on NBC’s “Meet the Press”: “I hope that we can put an end to this wild goose chase because what the President said was just patently false.”

Allegations makes waves among allies at home and abroad

Trump’s tweets are not just causing a political kerfuffle; they’ve sparked international diplomatic fallout.

White House efforts to support the claims ended up embroiling two key European allies: Britain and Germany. Officials in London were livid that White House spokesman Sean Spicer cited an unsubstantiated report that Britain’s Government Communications Headquarters – the British equivalent of the NSA – had been used by Obama in the operation. Germany’s Chancellor Angela Merkel, whose phone was once tapped by US intelligence, did not take kindly to Trump’s quip that they had something in common Friday.