This week on "FOX News Sunday," Senate Judiciary Chairman Lindsey Graham said he strongly supported President Trump's decision to authorize the attorney general to declassify information related to the Russia investigation and he is disappointed that the Democrats don't seem interested in finding out more about why and how the investigation started.



"I want all the documents around the FISA warrant application released. I want to find out exactly how the counterintelligence operation began. I think transparency is good for the American people. Not one Democrat seems to care."





"I was the hero when I said let's support Mueller," Graham said. "I wish some Democrat would come forward to find out if the FISA court was defrauded by the FBI and the Department of Justice."



"We’re not compromising national security here. We’re trying to create a system to make sure this never happens again by shedding light on what happened with the FISA warrant process, the counterintelligence investigation," he also said. "Did they have a lawful reason to surveil President Trump's campaign?"



"Did they lie to the FISA court? Every American should want to find that out."





And joining us now from South Carolina, Republican Senator Lindsey Graham, chair of the Senate Judiciary Committee.



Senator, President Trump, as we just reported, has given Attorney General Barr, quote, full and complete authority to get in declassify all government secrets related to the Russia investigation. Here is the president.



DONALD TRUMP, PRESIDENT OF THE UNITED STATES: I declassified everything, everything they want. I put it under the auspices of the attorney general. He's going to be in charge of it.



WALLACE: Senator, any problem with that?



SEN. LINDSEY GRAHAM (R-SC), SENATE JUDICIARY COMMITTEE CHAIRMAN: No, not at all from my point of view. I was one of the Republicans insisting that Mueller be allowed to do his job. I never thought it was a witch hunt. The report is in, no collusion. No -- you know, Mueller didn't do anything on obstruction.



Now, I’m insisting that we get to the bottom of this. I want all the documents around the FISA warrant application released. I want to find out exactly how the counterintelligence operation began. I think transparency is good for the American people. Not one Democrat seems to care.



I was the hero when I said let's support Mueller. I wish some Democrat would come forward to find out if the FISA court was defrauded by the FBI and the Department of Justice.



So, I support Attorney General Barr to make this as transparent as possible.



WALLACE: Critics make two points, particularly about this issue of declassifying, because these are, after all, the crown jewels of the intelligence community, including reportedly the identity of a key informant who is close to Vladimir Putin.



Here are the two questions that they raised: One, can Barr be trusted with these secrets? And two, can he be trusted not to cherry-pick the information to make a case for the president?



GRAHAM: Well, I think he can be trusted. I’m going to look at this. You know, nobody doubted my trust or my ability to be fair when I supported Mueller.



The people who are about this are worried about being exposed for taking the law in their own hands. It doesn't surprise me that the people we are looking at, they don't want transparency.



We’re not compromising national security here. We’re trying to create a system to make sure this never happens again by shedding light on what happened with the FISA warrant process, the counterintelligence investigation. Did they have a lawful reason to surveil President Trump's campaign? Did they lie to the FISA court?



Every American should want to find that out.

Watch the rest of Graham's interview on 'FOX News Sunday' this week: