The allegation that U.S. President Donald Trump called Ukraine's new leader to bully him into investigating former Vice President Joe Biden was too much. After months of warning her fellow Democrats about the perils of impeachment, House Speaker Nancy Pelosi has changed her mind.
At this moment, a normal president would tread lightly. Impeachment hearings and a Senate trial are not ideal in an election year.
But Trump is not a normal president. He has been irascible this week at the United Nations — insulting reporters, denying and then confirming elements of the allegations against him, taunting his opponents by calling openly for the investigation of Biden and his son.