Your freedom ends where the freedom of others begins.
This is pure and obvious defamation and is illegal in many civilized countries. That's how it has to be.
Only in the US people are so obsessed with 'free speech' that they actively protect hate speech.
Without this delusional interpretation of 'free speech', what Trump is doing most of the time wouldn't be acceptable or possible.
Of course it is too late when you already have a fascist, authoritarian government.
But to such a government it doesn't matter anyway. They will do whatever the fuck they want. They will introduce new laws if they feel like it. Putin had no problem to introduce a law which effectively lands you in jail for calling the war in Ukraine a war.
So I don't buy the implication that even hate speech has to be protected as free speech because the government could abuse it. The real world shows us very clearly that such governments do whatever they like, so that's just propaganda and wishful thinking at best.