Where's the illegality is what I've been asking for.
"No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of war or public danger; nor shall any person be subject for the same offence to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation."
It's the Fifth Amendment to the United States Constitution. Plain, complete, unaltered text.
We are not in a time of war or public danger. Regardless what that bloviating orange piece of shit says. Congress decides that, especially within US borders, not the president. So that's one way in which this case runs afoul of the Fifth Amendment.
Garcia's residential status had already been settled by the court once. That's two ways in which this case runs afoul of the Fifth Amendment.
Due process applies. It's "no
PERSON", not "no citizen". In other words,
everyone under United States jurisdiction is entitled to due process. Period. That's the third, final, and most important way in which this case runs afoul of the Fifth Amendment.