Van Hollen on Russia probe: 'What is the White House afraid of?'

Sen. Chris Van HollenChristopher (Chris) Van HollenDC train system losing 0k per day during government shutdown Senate Dems introduce legislation to back-pay low-wage contractors Government shutdown impasse is a leveraging crisis MORE (D-Md.) on Sunday urged the White House to let special counsel Robert Mueller complete his federal probe into Russia's election meddling, saying Republicans are making a "concerted effort" to undermine its credibility. 

"The question is what are they afraid of? What is the White House afraid of? Let's let [investigators] finish the job and get the facts," Van Hollen said on ABC News's "This Week."

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"I think Republicans should end their concerted effort to undermine the credibility of the Mueller investigation. You've got somebody who, by all accounts, who is an independent person, somebody who's got lots of integrity and you see a concerted effort out of the White House to undermine the investigation," he continued.

"I really hope our Republican colleagues will not join in subverting that process and trying to end this investigation," he said. 

Van Hollen's comments come as Republicans have pounced on the investigation after a series of text messages showing an anti-Trump bias from two FBI officials previously serving on Mueller's team surfaced from the 2016 presidential campaign. 

Republicans have accused the probe of having a bias against President TrumpDonald John TrumpTrump: I will deliver State of the Union 'when the shutdown is over' Former NYPD commander claims Trump got special treatment for gun licenses Colbert starts petition for Cardi B to give State of the Union rebuttal MORE.