Most cable news channels carried Comey and Rogers' five hours of testimony live instead of the first congressional hearing for Neil Gorsuch, Trump's widely praised nominee for the Supreme Court.
Trump himself has pushed back against these claims as recently as Monday morning, when he tweeted that there was "no evidence Potus colluded with Russian Federation".
FILE - Democratic presidential candidate Hillary Clinton speaks with senior aide Huma Abedin aboard her campaign plane at Westchester County Airport in White Plains.
At 7 a.m., he tweeted: "The real story that Congress, the Federal Bureau of Investigation and all others should be looking into is the leaking of Classified information".
Mr Comey said he could not provide further details about the investigation.
La sesión de la CIDH en Washington, con un ojo en Argentina
En esa audiencia, el secretario de Derechos Humanos, Claudio Avruj , será quien representará al Gobierno en el tema. La nacionalidad de quien delinque no es parte del debate.
National Security Agency head Michael Rogers also testified.
"We're expecting directors Comey and Rogers to shed light on Russia's active measures undertaken during the 2016 election campaign, the USA government's response, the compilation of the Intelligence Community's January 6 report on these events, and on related questions concerned possible surveillance on Trump campaign associates and on possible leaks of classified information", he said. Trump tweeted March 4 that his predecessor, Barack Obama, wiretapped Trump Tower before the election.
The hearing will be held at 10 a.m. Monday.
Both Trump's fellow Republicans as well as Democrats in Congress said they were frustrated by what they consider the intelligence community's failure to provide enough information about any contacts with Russian Federation, as well as Trump's claim, made without evidence, that his predecessor, Democrat Barack Obama, ordered a wiretap of Trump Tower.
He said that the FBI's investigation would also look into whether any crimes were committed. "Must find leaker now!" What does matter is this: "The Russians successfully meddled in our democracy, and our intelligence agencies have concluded that they will do so again".
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The British electronic intelligence agency, the GCHQ, said the report was "utterly ridiculous and should be ignored", but when asked about it Friday at a White House news conference, Trump deflected any blame for linking the British to his wiretapping allegation.
"We will never know whether the Russian intervention was determinative in such a close election".
Based on "everything I have up to this morning - no evidence of collusion", Nunes told Fox News.
There are also claims that former Trump Campaign Manager Paul Manafort, had been in contact with Russian officials. Trump fired Flynn, his former national security adviser, last month after he failed to disclose contacts with Russia's ambassador before Trump took office.
Brooke Singman is a Reporter for Fox News.
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Flynn later admitted talking to the ambassador about United States relations with Russia just as the Obama administration was slapping punitive new sanctions and expelling three dozen Russian officials over the election interference.