Can Trump change the Constitution?
He has very little power in regard to the Constitution.
The last time there was an Amendment to the constitution was in 1992 which basically said that any change in congressional pay would not take effect until the next term. That rule was first proposed in 1789.
Of over 11,000 attempts to change the constitution we only have 27 amendments, and that's counting the Bill of Rights which counts as the first ten amendments. So really, 17 times we've changed the U.S. Constitution since the Bill of Rights. Much of that happened around the Civil War.
We don't change our Constitution on a whim. Trump will not be changing anything.
A little trivia, there has only been one Amendment to the Constitution that has ever been undone.
In general the Constitution and especially the Amendments are constraints on our federal government. They define the role of government, usually by specifically mentioning what it cannot do, or the limit to which it can act. Only once in our history has the Constitution placed a control on the people. The 18th Amendment prohibited alcohol. The 21st Amendment deleted the 18th Amendment from our Constitution.
Our Constitution limits our government, not the people.
Trump has been pretty clear in that he doesn't understand, doesn't respect, and doesn't give half a **** about the Constitution. He's about to get an education.