Sen. Lindsey Graham Lindsey Olin GrahamMcConnell locks down key GOP votes in Supreme Court fight Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-S.C.) said Wednesday that there should be a special counsel to investigate Republican claims of improper surveillance of a Trump campaign aide, noting the Justice Department and FBI "got off the rails" by approving the warrant.

"I can’t believe that we’re not going to have a special counsel in these circumstances. The Department of Justice and the FBI got off the rails. They can’t investigate themselves," Graham said in a radio interview with Hugh Hewitt. "If there was ever a moment for a special counsel, it is now."

Hewitt noted the two House GOP chairmen who sent a letter on Tuesday to the Department of Justice (DOJ) asking for another special counsel to investigate claims that the Foreign Intelligence Surveillance Act (FISA) warrant for Trump campaign adviser Carter Page was improperly approved based on unverified opposition research.

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While the DOJ currently has its inspector general investigating the approval of the warrant, Graham explained that the Justice Department doesn't have the "institutional power" for a wide-ranging investigation outside the department.

When Hewitt asked why Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE doesn't do the "obvious thing" and appoint a special counsel, Graham noted that the top official probably had to recuse himself from the decision, just as he did from the wider Russia probe, and that Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE should appoint the counsel instead.

A memo by Republicans on the House Intelligence Committee published last month cited concerns over the evidence used to approve a FISA warrant. The concerns stem specifically from a dossier of opposition research on Trump written by a former British intelligence officer and paid for, in part, by the Democratic National Committee.

While Democrats on the committee have claimed that the dossier was among a large amount of evidence used in the decision to monitor Page, Republican lawmakers and administration officials have said the memo proves the FBI and DOJ were attempting to undermine President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

"The dossier is totally unverified, and he had a political agenda. This is a dangerous precedent to set," Graham said.