Donald Trump may not have had a “war room” at the ready to defend him against James Comey’s testimony before the Senate Intelligence Committee on Thursday, but there was a younger proxy tweeting furiously in his stead: Donald Trump Jr., who is both the president’s son and a current custodian of the Trump Organization. The White House’s own efforts to assemble an outside rapid-response team foundered at the last minute, as a potential phalanx of legal and communications experts—expected to be led by Corey Lewandowski and David Bossie—ended up being little more than Trump’s personal lawyer, Marc Kasowitz, who is expected to rebut Comey’s testimony after the hearing. Even the president himself was uncharacteristically quiet Thursday morning. Donald Jr., on the other hand, went on the warpath:

During an exchange with Republican Senator James Risch, Comey said that he took Trump’s statement (“I hope you can see your way clear to letting this go, to letting Flynn go”) as a "direction," not a suggestion or as an expression of preference. Don Jr. did not buy it:

At one point, Comey admitted that he wished he had been “stronger“ in telling the President that his conduct was inappropriate. Responded Junior:

Throughout Comey’s testimony, Don Jr.’s Twitter feed functioned as a clearinghouse for conservative talking points, analysis, and rebuttals: