Napolitano: Trump’s call with Ukraine president manifests criminal and impeachable behavior

The House of Representatives has begun to gather evidence in an effort to determine if President Trump has committed impeachable offenses. The Constitution defines an impeachable offense as "treason, bribery, or other high crimes and misdemeanors."

The president need not have committed a crime in order to be impeached, but he needs to have engaged in behavior that threatens the constitutional stability of the United States or the rule of law as we have come to know it.

Has Trump committed any impeachable offenses?