Why it matters: Sen. Ron Johnson (R-Wis.), who is leading the investigation, told supporters on Monday that “in about a week we’re going to learn a whole lot more of Vice President Biden’s unfitness for office.” The committee is investigating Hunter Biden’s work for Ukrainian gas company Burisma at a time when Joe Biden was leading the Obama administration’s Ukraine policy.

What he’s saying: “[The investigation] from the outset had the earmarks of a political exercise,” Romney said at a hearing on Wednesday. “I’m fearful that comments made in the media recently have only confirmed that perspective.”

“It’s not the legitimate role of government, for Congress or for taxpayer expense, to be used in an effort to damage political opponents.”

“I do believe it’s very important that the committees of Congress, and ours in particular, not fall into an increasing pattern that we’re seeing, which is using taxpayer dollars and the power of Congress to do political work. That’s the role of campaigns.”