House Oversight Chairman Jason Chaffetz said the Trump administration’s pick of Robert Mueller as special prosecutor for the investigation into Russia is “as good as it gets” in terms of finding an independent overseer.

“His credentials are impeccable. He served in the Bush administration, the Obama administration. He is unassailable in terms of his credentials, his background,” Chaffetz told Fox News host Tucker Carlson on Wednesday evening. “In the latter part of his career, he had nothing to prove. He has been silent politically. It doesn’t get any better than Robert Mueller.”