During CNN's "The Lead" on Wednesday night, host Jake Tapper warned viewers to be critical of claims made by President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE with a segment listing off "conspiracy theories" Trump has shared in the past.

Tapper's segment came in response to Trump's suggestion that a spy was planted in his 2016 presidential campaign.

He told viewers not to make assumptions about whether a spy existed until the Justice Department concludes its investigation into the issue.

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"While we await the investigation by the Justice Department's inspector general into this matter, it is worth remembering that while we are sticking to facts, the president has no such constraints. He simply makes stuff up," Tapper said.

"He frequently lies and has a long and well-documented career engaging in conspiracy theories about all manner of subjects, with no concrete evidence provided," he added.

Tapper continued by listing a number of theories shared by Trump that have little evidence behind them or have been debunked, including Trump saying during the campaign that Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE's (R-Texas) father may have been involved in assassinating former President Kennedy, and Trump's past claims that former President Obama wasn't born in the United States.

Trump has ramped up his attacks on special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's probe in recent days, repeating claims by conservative lawmakers that the Justice Department spied on his campaign in an attempt to stop Trump from winning the election.

"A lot of people are saying they had spies in my campaign. If they had spies in my campaign, that would be a disgrace to this country," Trump wrote on Twitter on Wednesday. "It would be very illegal, aside from everything else."

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“I hope they weren't," Trump continued. "That would be unprecedented in the history of our country.”

There is currently no evidence a spy or mole was embedded in the Trump campaign, though reports have said FBI agents used an informant to speak with Trump campaign advisers after it learned the campaign had questionable contacts with Russia.

Tapper said that while the "FBI is certainly not above criticism and without question," Trump seems to be "propelling a counternarrative to try to undermine the special counsel investigation."

Tapper added that he would "continue digging for the truth despite the bombardment of falsehoods."