[GianCarlo Canaparo is a legal fellow in The Heritage Foundation’s Meese Center for Legal and Judicial Studies.] [...] Let’s start with the Constitution. Article 1, Section 2 states that the House “shall have the sole Power of Impeachment.” Section 3 states that the Senate “shall have the sole Power to try all Impeachments.” Critically, there is no mention of procedure here. So where does this supposed transmittal requirement come from? The answer is the Senate’s own rules. Specifically, its rules governing impeachment procedure. The first rule of impeachment procedure states that the Senate will not act on an impeachment until...