Comey indicated that the probe into the Trump team's associations with Russia could last for months. His testimony also further undermined Trump's alarming allegation that Obama had wiretapped his campaign headquarters, which the president made without offering any supporting evidence.
The White House responds
Trump has been addressing the issue with a fresh round of messages to Twitter, raising questions about the Clinton campaign's contact with Russia and calling for the Congress and the FBI to focus their attention on stopping the leaks of classified information. In one tweet, Trump wrote: "The Democrats made up and pushed the Russian story as an excuse for running a terrible campaign. Big advantage in Electoral College & lost!"
In a briefing with reporters, White House Press Secretary Sean Spicer noted that Monday's hearing was the first of several the Intelligence Committee is planning, and that "the president is happy that they’re pursuing the facts in this."
He said that he was not aware of the FBI having interviewed anyone in the White House as part of its probe.
Spicer also pointed to comments made by Obama administration intelligence officials indicating that they had seen no firm evidence of ties between the campaign and Russia, and suggested that some of the people the FBI will scrutinize were simply aligned with the campaign but had no formal role in it.
"There's a point at which you continue to search for something that everybody who's been briefed hasn't seen or found," he said. "I think it's fine to look into it, but at the end of the day, they're going to come to the same conclusion that everybody else has had. So you can continue to look for something, but continuing to look for something that doesn't exist doesn’t matter."
Sign up for CIO Asia eNewsletters.