WASHINGTON (AP) — Acting Attorney General Matthew Whitaker has declined to answer a question about whether special counsel Robert Mueller’s investigation is a “witch hunt.”

President Donald Trump has repeatedly called the Russia probe a “witch hunt.” Asked by Democratic Tennessee Rep. Steve Cohen on Friday if he also thought it was, Whitaker declined to answer, citing the ongoing investigation.

Asked by Cohen if he would stop a “witch hunt,” Whitaker said it would be “inappropriate” to answer that question. Whitaker oversees the Mueller probe.

Trump’s permanent pick for attorney general, William Barr, has said he does not believe Mueller would be involved in a “witch hunt.”

Democrats are eager to press acting Whitaker during his first testimony to Congress on his interactions with Trump and his oversight of the special counsel’s Russia investigation.