Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans signal openness to working with Biden Loeffler calls for hearing in wake of Netflix's 'Cuties' Quinnipiac poll shows Graham, Harrison tied in South Carolina Senate race MORE (R-S.C.) is firing a warning shot at the FBI following his request that the agency hand over any evidence relating to wire taps of President Trump.

"They're about to screw up big time if they keep running to the [Intelligence] Committee and not answer that letter," the South Carolina told reporters, according to NBC News

"We have jurisdiction over the FBI," Graham noted , according to CBS News. "I like Director Comey a lot. But ... all things legal come through the Judiciary Committee."

He said if the FBI doesn't provide copies of any relevant warrant applications or court orders, "I would say that we need a joint select committee because the regular order is not working."

Senator Graham warns that the FBI is "about to screw up big time" by not responding to the letter from his subcommittee re: Trump wiretaps. pic.twitter.com/k6Gsqh2dtz — Alan He (@alanhe) March 14, 2017

The two senators—the top members on a Judiciary subcommittee on crime and terrorism—did not include a deadline for the officials to hand over the information in their letter.

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But Graham said Tuesday that he is still waiting for a response, and would announce next steps on Wednesday.

His subcommittee is scheduled to hold a hearing that day digging into "Russian efforts to undermine democracies."

Graham has warned that he will subpoena evidence on Trump's wiretapping claim if necessary.

"All I can say is that the country needs an answer to this," Graham told CNN earlier this month. "The current president has accused the former president of basically wiretapping his campaign."

Trump appeared to catch lawmakers off guard when he tweeted recently, without offering any evidence, that that former President Barack Obama had ordered a wiretap on his campaign.