Mitt Romney hasn’t even been sworn in as a senator, but he had strong words Wednesday over concerns that acting Attorney General Matt Whitaker would pull the plug on the Mueller investigation.

“ ‘It is imperative that the important work of the Justice Department continues, and that the Mueller investigation proceeds to its conclusion unimpeded.’ ” — Senator-elect Mitt Romney

Along with that warning to Whitaker, the onetime Republican presidential candidate, who won a U.S. Senate seat in Utah on Tuesday, also thanked Jeff Sessions for his service in a tweet late Wednesday.