A lawyer representing former President Donald Trump argued on Tuesday that a president cannot be prosecuted for ordering the assassination of his political rival unless he is convicted of committing an impeachable offense by the United States Senate. During questioning before an appeals court, Trump lawyer John Sauer was asked by Judge Florence Y. Pan point-blank if he believed that an impeachment and conviction in the United States Senate would be necessary before prosecuting a president for ordering the military to murder an opponent, and he affirmed that was the case. Most legal scholars ha…