Rep. Andy Biggs said there's no doubt that the 2016 Trump campaign was spied on, and he said Democratic lawmakers who argue to the contrary are "living in an alternative universe."

Attorney General Bill Barr has taken heavy criticism from Democrats and media figures after testifying Wednesday that “spying did occur” against the Trump campaign in 2016.

“He is acting as an employee of the president,” House Majority Leader Steny Hoyer (D-Md.) said. “I believe the Attorney General believes he needs to protect the president of the United States.”

House Speaker Nancy Pelosi (D-Calif.) told the Associated Press that she doesn’t “trust Barr,” but she trusts Special Counsel Robert Mueller. Senate Minority Leader Chuck Schumer (D-N.Y.) later accused Barr of “peddling conspiracy theories.”

A source told Fox News that with the term "spying," Barr was referring to intelligence collection that already has been widely reported and confirmed.

On "Outnumbered Overtime" Thursday, Biggs pointed out that Foreign Intelligence Surveillance Act (FISA) warrants against former Trump campaign aide Carter Page are currently the subject of a Justice Department inspector general investigation.

Biggs said there are serious questions about potential misconduct in the issuance of those warrants, including if they relied on the infamous anti-Trump dossier -- unverified political opposition research that was funded by the Hillary Clinton campaign and Democratic National Committee.

"I feel like the Democrats are living in an alternative universe. This is nothing new. And 'spying' is nothing more than saying somebody was gathering intelligence or information surreptitiously," Biggs said. "They're taking it and they want to inflame this thing, but they know it's true."

He added that Democrats are "changing their narrative constantly" following the revelation that Mueller found no evidence of Trump-Russia collusion and did not make a determination on obstruction of justice.

Watch the "Outnumbered Overtime" interview above.

Hannity: Criminal Indictments Coming Against 'Bad Actors' Who Started Trump-Russia Probe

'A Growling Bear With a Brain': Bill Bennett Says AG Barr 'Turned the Tables' on Dems

Limbaugh: Barr Blew Up Dems' 'Contrived Conspiracy,' But They Won't Let It Go