From the constitution “Before he enters the Execution of his Office, he shall take the following Oath or Affirmation:—’I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States.'”
Listen to this phone call and tell me is the treason?
Coast Contact 
At any other time in our history this would be called treason but for some reason trump seems able to do whatever he wants.