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

Sen. Chris Van HollenChristopher (Chris) Van HollenOvernight Energy: USDA expected to lose two-thirds of research staff in move west | EPA hails Trump's work on reducing air pollution | Agency eyes reducing inspections of nuclear reactors USDA expected to lose two-thirds of research staff in move to Kansas City Lawmakers pay tribute to late Justice Stevens 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 TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller MORE.