And it still comes down to, "Why was he stopped?" in the first place.
And it still comes down to security measures in place which are described in the bipartisan USA PATRIOT buttfucking-your-freedoms act.
ICE isn't known for actually following the law, in the same way that Donald Trump himself isn't known for following the law, or even the rules of basic human decency.
Guess what? Neither is any other part of the US Government. You name it, our government has done it, including coups, assassinations, coups, genocides, false flags, drug trafficking, human trafficking, willfully selling munitions to international criminals... and most of it within our lifetimes. Yes, Trump is a gigantic piece of orange shit, but this country was doing plenty of evil before he was elected. Or even born, for that matter. And it will still be doing evil when he's dead.