Chairman of the United States House Permanent Select Committee on Intelligence, Republican Rep. Devin Nunes, threatened journalist with an investigation if they continued digging around into Russia’s ties with Attorney General Jeff Sessions.

Although Sessions may have not been honest when he told the Senate Judiciary Committee that he had not communicated with Russian officials during the 2016 campaign, Nunes refuses calls for an investigation from his committee.

“I read about this in the newspaper and I see some of you talking about,” Nunes told reporters. “If you have those names [of anonymous sources], if you want to come forward as a whistleblower and bring those to us, we would greatly appreciate it. Because we would like to have those names, bring those people in.”

Nunes also pointed out that when former National Security Advisor Michael Flynn communicated with the Russian ambassador and lied about it, he was still a private citizen.

“Look, I’m sure some of you are in contact with the Russian embassies,” Nunes said ominously. “So be careful what you ask for here because if we start getting transcripts of any of you or other Americans talking to the press then do you want us to conduct an investigation on you or other Americans because you were talking to the Russian Embassy.”

“I just think we need to be careful.”

The congressman, who was also a part of Trump’s transition team, later claimed that he was not threatening anybody with an investigation.

“I was saying the opposite and warning against engaging in witch-hunts,” he tweeted Thursday.