Senate Judiciary Committee Chairman Chuck Grassley said Wednesday that Sen. Dianne Feinstein’s decision to unilaterally release Fusion GPS co-founder Glenn Simpson’s summer 2017 testimony could make it harder for the committee to get testimony from other witnesses as it continues to investigate Russia.

“It may make a lot of people a little more reserved whether or not they want to cooperate, including in regard to Jared Kushner […] very high profile person as an example. But we’ll continue to move forward,” Grassley said. He added that Kushner, the senior adviser to President Trump, is “not at all” off the hook for appearing before Senate Judiciary.