The only reason Trump gets away with it is because Congress is complicit in the authoritarian fiction of the President's "plenary authority" even to the point of obviously illegal things like undermining budget allocations and not doing their actual jobs.
As soon as a Democrat gets in, Congress will miraculously become pedantic sticklers to the rules. This kind of corruption and blatant malfeasance is something only Republicans get away with, at least in the modern era.