On Jan. 13, while he was the president of the United States, Donald Trump was impeached by the House of Representatives.

Based on the charge of “incitement of insurrection,” House Speaker Nancy Pelosi, R-California, sent one article of impeachment of Trump to the Senate on Jan. 25. The Senate trial is slated to start on Feb. 8. The specter of an impeachment trial against a former president raises both constitutional issues of permissibility as well as prudential issues of advisability.