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

Sen. Chris Van HollenChristopher (Chris) Van HollenOvernight Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families Senate Foreign Relations chair: 'Best' not to pass Turkey sanctions bill 'at this moment' On The Money: Retirement savings bill blocked in Senate after fight over amendments | Stopgap bill may set up December spending fight | Hardwood industry pleads for relief from Trump trade war 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."

ADVERTISEMENT

"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 reversed course on flavored e-cigarette ban over fear of job losses: report Trump to award National Medal of Arts to actor Jon Voight Sondland notified Trump officials of investigation push ahead of Ukraine call: report MORE.