President Donald Trump has so far stayed off Twitter during former FBI Director James Comey's testimony. But his eldest son hasn't.
Donald Trump Jr has tweeted repeatedly during the closely watched testimony Thursday.
He repeatedly defended his father and attacked Comey.
Trump Jr in particular seized on Comey's assertion that he interpreted the president's statement that he "hoped" the FBI would drop its probe into former National Security Adviser Michael Flynn.
Trump Jr tweeted "you would think a guy like Comey" would know the difference between "hoping and telling".
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He also cast doubt on all of Comey's testimony and said he should "have actually followed procedure".
Donald Trump Jr and his brother Eric are now at the helm of their father's New York-based business.
