Boston.com: An ‘Impeach & Remove Rally’ will be held on Boston Common Tuesday night. This is what’s happening.

“There is a lot of fear about what a president going unchecked could mean for the future of our democracy and what standard that could set for sitting presidents,” Kristina Mensik, assistant director at Common Cause Massachusetts — the nonpartisan, grassroots organization that’s a lead organizer of Tuesday’s rally — told Boston.com.