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Rep. Matt Gaetz (R-Fla.) believes Special Counsel Robert Mueller's Russia investigation is "riddled with bias," and Attorney General Jeff Sessions should bring the probe to a close.

"It's time for Bob Mueller to put up or shut up," Gaetz said on "Happening Now." "If there's evidence of collusion, let's see it. If there's not, let's move on as a country."

He said he has yet to see any evidence of the Trump campaign or transition team colluding with Russia, but if there is any evidence, it needs to be analyzed to determine to what extent it may have been tainted by the biases of Mueller's team.

"But that will only happen if Attorney General Sessions stops being a spectator and actually steps up and leads the Department of Justice and shuts down this biased investigation," Gaetz said.

The Justice Department has said a senior federal prosecutor is reviewing whether a second special counsel is needed to look into the Mueller probe.

He noted that FBI Director Andrew McCabe testified behind closed doors before the House Intelligence Committee on Tuesday, and the Senate Intelligence Committee will interview demoted DOJ official Bruce Ohr on Thursday.

Gaetz said he's calling for "open, sworn testimony" from FBI and DOJ officials to give the American people better transparency about the what role they played in the 2016 investigation, along with the probes into Hillary Clinton's private email server and Russia's election meddling.

"The senior levels of the FBI have been infected with an intractable bias that seemed to favor Hillary Clinton and work against President Donald Trump," he said. "That is totally unacceptable, and it poses a clear and present danger to our democracy. That's why we've got to expose the truth."

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