Yes there are laws against what he is doing. That hasn't stopped him.
Both Congress and the Courts can stop him. Some judges are trying, but they are just ignoring orders. Congress can stop his use of the Alien Enemy Act at any time, but wont. They can stop the tariffs, too. They can impeach him tomorrow and remove him. They wont. They are all mostly complicit in this Authoritarian takeover.
I don't think people not in the US fully understand what is happening here to be honest.
His weekend Los Angeles military fling is expected to cost $165 million by the way. On top of the $45 million he is spending in his big birthday parade.
But we cant afford to help people get food and healthcare here.
This article shows maps of how (not very big) these protests actually are. About 3 blocks is it. It also shows the protests during the day, more people who are peaceful, vs night time, fewer people who are violent. As of yesterday, a mere 42 people had been arrested.
42.
Tell me why they need over 4,000 military troops to cover 3 square blocks for 42 arrests?