When people take high government positions i.e., President, Speaker of the House,  and so forth who swear to “uphold the Constitition of the United States of America” and then say for all to hear on radio or television that they think the Constitution is “flawed” and should be changed,  could they be guilty of Perjury? Yes.  Why? Because they had to have  lied when they took the oath. One does not “suddenly” change their minds. Our Constitution has been sacred to the people of this United States of America and was not founded with the intention to change our country into a Constitutionless, Communist- socialist, run country. “WE THE PEOPLE” run this country, not Dictators, Kings and Self-Appointed Gods. And, they do say at the end of taking the oath to uphold the Constitution of the United States of America, “so help me God!”

Is lying when taking an Oath Perjury? Yes. Can it be impeachable? Yes.

[Law: the crime of swearing on oath that something is true which one knows is false or of telling a lie when under oath to tell the truth. Failure to do what one has sworn an oath to do.]