In theory, executive orders can't contradict federal laws passed by congress, nor any treaty, nor any of the rights of the American people.
In practice, Democrats are mad with lust for power and would just as soon wipe their buttholes with the U.S. Constitution. Separation of powers be damned. Bill of Rights be damned. Like little children, they can only think "I want what I want, and I want it now, and you can't tell ME no!" (Hmm... well, I think Trump has the same attitude, but lucky for us he doesn't want to change the same things that Biden / Harris want to change through E.O.'s).
What it comes down to is what the federal courts will let them get away with.
Sometimes the Court will tell a President that he's gone too far.
In practice, Democrats are mad with lust for power and would just as soon wipe their buttholes with the U.S. Constitution. Separation of powers be damned. Bill of Rights be damned. Like little children, they can only think "I want what I want, and I want it now, and you can't tell ME no!" (Hmm... well, I think Trump has the same attitude, but lucky for us he doesn't want to change the same things that Biden / Harris want to change through E.O.'s).
What it comes down to is what the federal courts will let them get away with.
Sometimes the Court will tell a President that he's gone too far.