No private citizen in the United States of America should ever have cause to worry about the wrath of the President. The powers of the Executive Branch should never, ever be wielded as tools of an Executive vendetta.
This is the sort of thing that is done in a banana republic, not a democracy. But this is where we are now, thanks to the Banana Republican Party, which (with the lone exception of Mitt Romney, who has been vilified on that account) has stood behind Trump to the last Congressperson.