Or the administration could ask congress to pass a law to this effect. Like we used to do back during normal Republic times. Could have done that with the tariffs and then they'd have been legal.
Tariffs, deportations, attacks on drug boats, wars... almost all of the illegal shit the Trump administration has done could easily have been made legal by the GOP-controlled Congress. Early on in Trump 2.0 I wrote several letters to my very MAGA Senator, Mike Lee, begging him to sponsor and support legislation to do exactly that. Not because I thought the things Trump wanted to do were good but because I saw huge potential harm to the Republic if Congress just allowed the executive to flout the law.
Of course, Lee never responded to me. At all. And never lifted a finger to provide actual authorization for Trump's lawbreaking -- and, of course, Trump never asked the GOP Congress to do it.
The only reasonable conclusion is that Trump and the GOP (and SCOTUS) don't want the president to be constrained by law, and so Trump is deliberately doing all of this without Congressional approval in order to firmly establish the precedent that he doesn't need Congressional approval. He's doing the same thing now with the Iran war, having run out the 60-day clock but refusing even to ask Congress to authorize him to continue. GOP leadership is waffling, making up stuff (not found in the law!) about how the 60-day clock "stops" during a temporary ceasefire.
The truth is that Trump wants to be King, and the GOP wants him to be King. If Mike Johnson and John Thune wanted to, they could make Trump's actions lawful, but they want him to be able to ignore the law.