I'm not a conservative. I'm absolutely in favor of free speech, modulo paid speech, as I listed above.

Deportation does require some process, but you're not being charged with a crime, you're being returned to freedom in your own country. If a democratically elected government demonstrates that you are not a citizen, and judges that the country would be better off without you in it, and further gained its mandate from the position that it would deport you, I'd be hard pressed to find a legal reason why this policy should be prevented. The first amendment protects you from prosecution, not deportation. We'll see if the supreme court agrees.