Hopefully, by the end of this year these two events will merge together to ruin trumps presidency.
1. Trump is unable to pass any major legislation. No healthcare reform, no tax reform, no infrastructure bill and no dam wall. If this happens he will be labeled as a failure, someone who can't get anything done. We must stop the wall from being built. This would be a giant scar on america. We can not let trump leave a legacy like the wall. He must become a footnote in american history.
2. The FBI investigation leads to charges against people in his campaign for collusion. I don't know if they will be able to nail trump with collusion but we don't have too. Nailing people in his campaign will do great damage.
If all this happens the democrats will be in great shape for next years midterm elections. If we can take back the congress we can turn trump into a lame duck. It will be a long four years but we can limit the damage until we can vote his dumbass out of office. Unfortunately we can not protect ourselves if wants to start a war.