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House Intelligence Committee Chairman Devin Nunes (R-Calif.) joined Bret Baier on "Special Report" on Friday to discuss Republicans' release of a memo alleging U.S. government surveillance abuses.

Democrats have alleged key facts were not included in the memo, calling it misleading and accusing Republicans of trying to undermine Special Counsel Robert Mueller's investigation.

The memo asserts that former FBI Deputy Director Andy McCabe stated in closed-door testimony that without the anti-Trump dossier, the FBI would not have been able to secure surveillance warrants against the Trump campaign.

It also claims the dossier's author, Christopher Steele, expressed a personal animus toward Trump.

Nunes, who co-wrote the memo with Rep. Trey Gowdy (R-S.C.), said he didn't want to release the memo, but he had an obligation to the American people when he saw FISA abuse.

"They wouldn't have received a warrant without the dossier," Nunes said. "The dossier was presented to the court as if it was true. The court was not told that the Democrats actually paid for this."

He said it's wrong that the FBI used opposition research -- paid for by the Democratic Party and the Hillary Clinton campaign -- to secure surveillance on at least one Trump associate.

As for allegations about collusion between the Trump campaign and Russia, Nunes noted that much of the information in the dossier came from Russian sources.

"So there's clear evidence of collusion with the Russians," Nunes said. "It just happens to be with the Hillary Clinton campaign and the Democratic National Committee."

Watch more above.

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