It is, and we are pretty close to the bottom. Civil liberties folks have been calling it out for decades. Congress has delegated far too much power to the President. Trump is testing and sometimes exceeding the boundaries of his power, but most of this stuff is legal. The executive shouldn't be able to unilaterally slap tariffs on things, but it can. The law should spell out the criteria for foreigners to be allowed to enter the country, but instead we give the executive total discretion, and the executive has granted the individual agents total discretion.

It was pretty clear for a long time that this stuff was ripe for abuse, and the President's own choices were the only thing preventing it from being abused more than it was.

Well, you put a fundamentally terrible* and vindictive person in that office, and surprise, he abuses this power. One of his first acts in office in 2017 was to abuse his ability to unilaterally dictate which foreigners are allowed to enter the country, no surprise it's even worse now. Despite this, there has been pretty much zero serious advocacy for restraining the power of the executive.

*All US presidents are terrible to some degree or another, but normally it's "I know what's best for the country and I'm willing to kill for it." Which isn't great, but it's better than this.