The answer is very simple:
Trump wants to establish the same kind of right-wing alliance Hitler, Franco, Mannerheim, Mussolini and Tojo had in order to destroy their working class opposition and impose rule over the entire world to make the world "free" for Wall Street and its junior partners to rape Mother Nature and exploit labor in quest of maximum profits. Wall Street brought Trump to power to do this.
We are going to pay a very heavy price, most probably nuclear war and the entailing nuclear winter, if we don't unite to stop this right wing cabal Wall Street is assembling.
I would recommend reading "The People's Front" written by the primary architect, organizer and leader of this most important coalition of liberals, progressives and leftists ever assembled in this country which won the New Deal and tried to prevent World War II... Earl Browder. You can get the book through your local public library or purchase a copy on line. Anyone interested in building a huge coalition to defeat Trump and drive him and his fascist cabal out of the White House should give this book a thorough study. Even if you don't agree with all of Browder's ideas, there is much to learn about coalition building. Reading a book can't hurt you; what you don't learn might hurt all of us. I don't think anyone disputes the fact that "The People's Front" of the 1930's was the most powerful coalition ever built to oppose our common enemy: Wall Street... and many reforms were won in the process of trying to challenge Wall Street for political and economic power. Browder, in his book, identified Wall Street as "our common enemy."