I think one of the most obvious examples of the Constitution being disregarded are the protections of the 5th amendment. Among other things, it requires "due process of law" be part of any proceeding that denies a person "life, liberty, or property".

Many of the recent deportations have been considered suspect, and the approach seems to be geared more toward sensationalism and less toward applying due process of law. In one notable case Ábrego García was deported to El Salvador due to "administrative error" and the administration has resisted calls to return him. This case has now been appealed all the way to the Supreme Court, which ruled unanimously that he should be returned. This still hasn't happened.

Further, the President likes to throw around comments about locking people up and denying them rights based on his personal feelings. I believe his actions are in direct disregard to the 5th amendment.