WASHINGTON (AP) — FBI Director James Comey and Mike Rogers, the director of the National Security Agency, say they have no evidence or intelligence that Russian cyber actors changed vote tallies in key states during last year’s presidential election.

Testifying at a highly politically charged congressional hearing in the House, both said they had no evidence that any vote tallies were changed in Michigan, Pennsylvania, Wisconsin, Florida, North Carolina or Ohio.

Comey confirmed Monday that the bureau is investigating possible links and coordination between Russia and associates of President Donald Trump as part of a broader probe of Russian interference in last year’s presidential election.

The extraordinary revelation came at the outset of Comey’s opening statement in a congressional hearing examining Russian meddling and possible connections between Moscow and Trump’s campaign. He acknowledged that the FBI does not ordinarily discuss ongoing investigations, but said he’d been authorized to do so given the extreme public interest in this case.

“This work is very complex, and there is no way for me to give you a timetable for when it will be done,” Comey told the House Intelligence Committee.

Earlier in the hearing, the chairman of the committee contradicted an assertion from Trump by saying that there had been no wiretap of Trump Tower. But Rep. Devin Nunes, a California Republican whose committee is one of several investigating, said that other forms of surveillance of Trump and his associates have not been ruled out.

Comey was testifying at Monday’s hearing along with National Security Agency Director Michael Rogers.

Trump, who recently accused President Barack Obama of wiretapping his New York skyscraper during the campaign, took to Twitter before the hearing began, accusing Democrats of making up allegations about his campaign associates’ contact with Russia during the election. He said Congress and the FBI should be going after media leaks and maybe even Hillary Clinton instead.

“The real story that Congress, the FBI and others should be looking into is the leaking of Classified information. Must find leaker now!” Trump tweeted early Monday as news coverage on the Russia allegations dominated the morning’s cable news.

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