President Trump is angry and gearing up for a fight over former FBI Director Comey's testimony before the Senate Intelligence Committee, the Washington Post reported Tuesday.

Two senior White House officials told the newspaper that Trump is planning on responding to Comey's comments via Twitter, and Trump's official schedule is clear before his first event at 12:30 p.m.

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Former House Speaker Newt Gingrich told the Post that Trump is "infuriated at a deep-gut, personal level" with the news media for covering the Russia investigation story, and for praising Comey after Trump's decision to fire him.

“He’s not going to let some guy like that smear him without punching him as hard as he can," Gingrich said.

White House Press Secretary Sean Spicer said Tuesday that Trump would be focused on other issues on Thursday, but didn't rule out Trump tweeting during the hearing.

“The president’s going to have a very, very busy day,” Spicer said. “I think his focus is going to be on pursuing the agenda and the priorities that he was elected to do.”

Former campaign aide and longtime confidante Roger Stone told the Washington Post that Trump wouldn't take Comey's testimony sitting down.

“He’s not going to take an attack by James Comey laying down,” said Stone. “Trump is a fighter, he’s a brawler and he’s the best counterpuncher in American politics.”

Trump's tweets have caused problems for him in the Russia investigation previously. Earlier Tuesday it was reported that four top law firms declined to represent Trump in the investigation into ties between his administration and Russia over concerns that Trump wouldn't follow their advice.