Graham: Mueller is going to be allowed to finish investigation

Sen. Lindsey GrahamLindsey Olin GrahamTrump says he'll '100 percent' veto measure blocking emergency declaration Overnight Defense: Dems tee up Tuesday vote against Trump's emergency declaration | GOP expects few defections | Trump doubles number of troops staying in Syria to 400 On The Money: Dems set Tuesday vote on Trump's emergency declaration | Most Republicans expected to back Trump | Senate plots to avoid fall shutdown drama | Powell heading before Congress MORE (R-S.C.) said Sunday that special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's probe into alleged collusion between the Trump campaign and Russia will finish unimpeded.

"Nothing's going to happen to Mueller's investigation politically. He's going to be allowed to finish it," Graham told CBS's "Face the Nation."

"I'm intent on making sure that Mueller completes his investigation without political interference," he added. 

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However, Graham said he was concerned about others involved in the initial stages of the Russia probe.

"I'm very disappointed no Democrats seem to be worried about the corruption at the Department of Justice and the FBI regarding the Clinton email investigation, early stages of the Russian investigation," Graham said. "I'm worried about that."

He also expressed very little confidence that Mueller would find any evidence of collusion.

"I know that from the Judiciary point of view, we found no evidence of collusion between the Trump campaign and the Russians," Graham said. "I think [Sen.] Richard BurrRichard Mauze BurrTrump says ‘witch hunt’ must end as reports say Mueller preparing to file report Cohen to testify before Senate Intel on Tuesday Harris on election security: 'Russia can't hack a piece of paper' MORE [R-N.C.] said from the Intel point of view that he's seen no evidence of collusion, but we're waiting on Mueller."

"Let's let Mueller do his job," Graham said.

President TrumpDonald John TrumpAverage tax refunds down double-digits, IRS data shows White House warns Maduro as Venezuela orders partial closure of border with Colombia Trump administration directs 1,000 more troops to Mexican border MORE and his Republican allies on Capitol Hill have repeatedly expressed that they want the Mueller probe to end, fueling concern among Democrats that the GOP is trying to impede the investigation.

Last Thursday, Trump told Bloomberg News that he considered the investigation "illegal," a statement the president doubled down on Sunday morning.

"The illegal Mueller Witch Hunt continues in search of a crime," Trump tweeted out. "There was never Collusion with Russia, except by the Clinton campaign, so the 17 Angry Democrats are looking at anything they can find."

"ALSO, not allowed under the LAW," he said.