No I don’t think either of our major political parties are extreme. Do both parties have some members and a few policies that may lean extreme…yes.
What would you call extreme?
For what its worth I don't think I would consider Trump's first term extreme. Some of the anti mask anti vaccination stuff yes, but 2017 spending bill, Supreme Court nominees-that sort of stuff was pretty standard republican politics. Claiming the election was rigged and trying to circumvent the results through violence-yep and its found a way to go downhill from there.