Senate Judiciary Committee Chairman Lindsey Graham said on "Hannity" Tuesday that he hopes Attorney General Bill Barr thoroughly investigates the origins of the FBI's investigation of the Trump campaign.

"Somebody needs to look at this like they looked at Trump. We have got to get to the bottom of it and make sure it never happens again," Graham said.

Mueller found no evidence that Trump or his campaign coordinated with the Russians to interfere in the election. But Mueller did not come to a conclusion on whether the president obstructed justice.

Graham said the FISA warrant to surveil Carter Page was issued on the basis of the claims made in ex-British spy Christopher Steele's unverified dossier and would not have been granted otherwise. Graham and Hannity questioned why Mueller didn't investigate further into the origins of the Steele dossier, and when exactly he became aware that there wasn't evidence of collusion.

"What I want to know is: when did [Mueller] know there was no conspiracy with The Trump campaign and Russia as it relates to collusion of any kind?" Hannity asked. "Why was he not concerned about Hillary's dirty Russian dossier when he had plenty of time to look into medallions and laws and taxes?

"I would think the Russian dossier would have been important to Robert Mueller," Hannity added.

Graham said he would "pledge" to the American people that he will look into those questions. 

Earlier in his opening monologue, Hannity said Democrats refused to accept the 2016 election results and now refuse to accept the outcome of the Mueller probe.

He emphasized that Barr was not legally required to release the Mueller report to the public and is following the law by refusing a subpoena for the unredacted version of the report and the underlying documents.

Trump invoked executive privilege over the materials Wednesday, with House Democrats scheduled to vote on whether to hold Barr in contempt of Congress for not turning over the documents.

Watch the monologue below. 



'I Was Concerned': Mom, Teen Daughters Harassed by PA Dem Outside Planned Parenthood Clinic

'Clutching at Straws': Steyn on Hillary Clinton Claiming Election Was 'Stolen' From Her