What is the potential consequence of a President suggesting punishment for citizens exercising their rights, and why do some believe it is an impeachable offense?
It's the President's job to protect and uphold the Constitution.  The President suggesting punishment for citizens exercising their rights afforded by the Constitution is subversion against the country.  This is an impeachable offense. I'm shocked nobody is pursuing this but instead playing around with the Russian garbage that'll likely turn into a lot of nothing.