I ___, do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all ... discharge the duties of the office on which I am about to enter.

or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States ...

In his first news conference since returning to the Oval Office, Trump defended supporters who were convicted of violent crimes — and condemned political opponents who were not.