He could try assembling an emergency team and also pressure Republicans and tell them what’s at stake. They could hold a special meeting.

That’s a good start. I would recommend also trying to form groups to pressure companies to no longer donate to republicans. Also work to get people away from misinformation platforms such as X and Fox News. I’m not in the EU but if you know anyone in there they could help with this petition: https://ban-x-in.eu/

This is a very important article. When talking to someone on the other side first find common ground. When having a conversation with someone both you and the other person must listen to and respect each other. Finding common ground before talking about your differences can be a great way to help achieve that.