Carl Bernstein traded barbs with President Trump Wednesday after the president first lashed out at the journalist of Watergate fame for a disputed report regarding what Trump knew in the lead-up to the controversial Trump Tower meeting.

“.@realdonaIdtrump- I have spent my life as a journalist bringing the truth to light, through administrations of both parties,” Bernstein wrote on Twitter. “No taunt will diminish my commitment to that mission, which is the essential role of a free press. @CNN stands by its story, and I stand by my reporting.”