Graham: Mueller is going to be allowed to finish investigation

Sen. Lindsey GrahamLindsey Olin GrahamKim, Moon toss ball to Trump in ‘last, best chance’ for Korean peace GOP senator: Kavanaugh accuser 'moving the goalposts' Collins: Kavanaugh accuser should 'reconsider,' testify on Monday 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 assures storm victims in Carolinas: 'We will be there 100 percent' Overnight Energy: Trump rolls back methane pollution rule | EPA watchdog to step down | China puts tariffs on US gas Graham: Mueller is going to be allowed to finish investigation 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 TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada 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.