Let's just clarify that visitors don't have the same rights as citizens. Whether or not you agree with the current administration's policies hopefully we can agree that it is entirely reasonable for them to deport foreign political dissidents more or less at their discretion.
If you want to put this to the test try crossing the Canadian border and when they ask you the purpose of your visit respond that it's to attend a protest.
If you want to put this to the test try crossing the Canadian border and when they ask you the purpose of your visit respond that it's to attend a protest.