Rep. Jim Himes James (Jim) Andres HimesMany Democrats want John Bolton's testimony, but Pelosi stays mum SEC's Clayton demurs on firing of Manhattan US attorney he would replace Democrats face tough questions with Bolton MORE (D-Conn.) said during an interview early Wednesday that House Intelligence Committee Chairman Devin Nunes Devin Gerald NunesSunday shows preview: With less than two months to go, race for the White House heats up Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington Sunday shows preview: White House, congressional Democrats unable to breach stalemate over coronavirus relief MORE's (R-Calif.) behavior has been “aggressive” and “unusual” in recent days.

“A lot of us have a lot of history with Chairman Nunes and consider him a friend, but until we really get a read into whatever drove last week’s behavior, it’s really hard for us, along with the rest of the American public, not to make some assumptions about what is driving this very strange behavior,” Himes said on CNN’s “New Day.”

Himes, a House Intelligence Committee member, added that the panel’s functions have stalled since Nunes said there was incidental intelligence surveillance of President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s transition team last week.

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“We’ve just been completely frozen,” he told host Alisyn Camerota. "There’s been no communication. We need to understand exactly what happened. We need to be made comfortable.

“When you cancel all the ordinary business meetings of the committee, it’s kind of up to the individual who does that to say, ‘Here’s why I did that.' And we haven’t been offered that explanation yet.”

Nunes is facing scrutiny after revealing last week that he has seen evidence that the U.S. intelligence community incidentally surveilled Trump’s transition team before the president took office.

The California lawmaker met with an unidentified source on White House grounds the day before his bombshell announcement to view evidence of the surveillance.

Nunes said Tuesday he would not publicly reveal sources amid pressure to do so from fellow Intelligence Committee members.

Multiple Democrats have urged Nunes to recuse himself from his panel’s investigation into Russian meddling in the 2016 presidential campaign.