. He's simply levying the protocols of border control in line with its purpose, to filter people who might not act 'in the public good'. Is it excessive to use it to deny entry to trolls? Probably, but that's another matter.
Twenty years ago I was friends with a guy who was refused re-entry to the US because he posted on social media (Myspace back then I think it was) a joke about slapping his boss in the face with a burger. He'd previously visited on a work visa, fallen out with the boss of the burger joint he worked at, and posted a joke online when he returned. That doesn't mean George W Bush had taken it upon himself to restrict the free speech of foreigners who made jokes about beef burgers, it's simply part of the border control process of all countries.