van der Veen was selected to serve as co-counsel, alongside William J. Brennan,
Bruce L. Castor, Jr., and
David I. Schoen, on the defense team for then former president Donald Trump during Trump’s second impeachment trial. On February 12 and 13, 2021, van der Veen presented arguments for the defense of Donald Trump at the former president's
second impeachment trial. van der Veen responded by stating that such procedures were consistent with civil litigation practice. At the conclusion of the trial, the Senate voted 57–43 to convict Donald Trump of inciting
insurrection in the January 6, 2021
attack on the U.S. Capitol. Trump was acquitted because the
U.S. Constitution requires that two-thirds of the Senate must vote for conviction. Seven Republican senators voted to convict Donald Trump, the largest bipartisan vote for an impeachment conviction of a U.S. president. Following the trial, van der Veen participated in a televised interview with
CBS News anchor Lana Zak, during which the two disagreed over the characterization of evidence presented at trial. The interview ended abruptly when van der Veen removed his microphone and exited the set. van der Veen also appeared on
Hannity, hosted by
Sean Hannity, where he discussed the defense’s legal strategy and criticized the impeachment proceedings. During the interview, he argued that the case against Donald Trump lacked sufficient evidentiary support and characterized the trial as politically motivated. van der Veen was played by
Pete Davidson in the
cold open of
Saturday Night Live on February 13, 2021. After the trial, his residence and law office were the subject of protests and vandalism, which were reported by local and national media. == Personal life ==