Rep. Michael McCaul (R-Texas) warned that there would be bipartisan backlash against President Trump if he fires special counsel Robert Mueller, who is leading the probe into Russia meddling in the 2016 presidential campaign.

“If he fired Bob Mueller, I think he’d see a tremendous backlash response from both Democrats but also House Republicans,” he said.

Trump has recently blasted Mueller for announcing that he is looking into Trump’s business finances as part of the Russia probe, after the president said he thinks it’s a violation of the guidelines for the probe. Trump added that he would consider firing Mueller as special counsel.

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The president was particularly troubled with the fact that Mueller would investigate his tax returns, which Trump repeatedly declined to release to the public.

McCaul said Republicans are frustrated with trying to pass legislation on healthcare and tax reform, and said he hopes Trump will stay “on message” with a shakeup in the White House press office.

White House press secretary Sean Spicer announced he would resign from his post Friday, after the press office appointed Anthony Scaramucci as the communication director.

“It is frustrating,” McCaul said. “I hope with the new team with the new people around him perhaps he can get back on message.”

“We want a more disciplined White House on message so we can stay on message and get the things done what we need to get done.”