Graham: Mueller is going to be allowed to finish investigation

Sen. Lindsey GrahamLindsey Olin GrahamSecond ex-Senate staffer charged in aiding doxxing of GOP senators Second ex-Senate staffer charged in aiding doxxing of GOP senators Meghan McCain clashes with Joy Behar as the 'sacrificial Republican' on 'The View' MORE (R-S.C.) said Sunday that special counsel Robert MuellerRobert (Bob) Swan MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump 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 BurrGOP frets about Trump's poll numbers GOP frets about Trump's poll numbers Democrats detail new strategy to pressure McConnell on election security bills 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 TrumpBooker hits Biden's defense of remarks about segregationist senators: 'He's better than this' Booker hits Biden's defense of remarks about segregationist senators: 'He's better than this' Trump says Democrats are handing out subpoenas 'like they're cookies' 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.