As the Senate trial judging Donald Trump’s second impeachment got underway on Tuesday, his lead defense attorney, Bruce Castor, offered an unexpected rationale for setting the impeachment aside.

“There is no opportunity where the president of the United States can run rampant in January at the end of his term and just go away scot-free,” Castor said. “The Department of Justice does know what to do with such people.”

After all, if the president had committed crimes, “after he’s out of office, you go and arrest him,” he said.

Reporting suggests that Trump, watching from Mar-a-Lago, wasn’t happy with Castor’s performance. Given his attorney’s embrace of potentially having his client arrested, one can understand why.