From The Bulwark:

2) Regarding the offenses President Trump is accused of: Back when President Clinton was facing impeachment, Turley argued that an act didn’t have to meet the definition of a crime to be impeachable, as Paul Rosenzweig pointed out to The Bulwark today. Rosenzweig, a former lawyer on Ken Starr’s Whitewater investigation staff, noted by email: “Twenty years ago, Professor Turley wrote that a crime did not have to be committed for an action of the President to be an impeachable offense.” Today, though, Turley insists that for an action to count as bribery under the impeachment clause, it must satisfy the legal definition of the criminal offense of bribery—“an opinion,” Rosenzweig says, “that is manifestly wrong, if only because the impeachment clause was written before we created federal criminal law.” So, Rosenzweig asks of Turley, “What changed? One suspects that the only relevant change was the party affiliation of the President. Situational ethics are . . . situational.”