They want and need a 1 party system to be able to do what they want. He’s done plenty for their side, but it’s never enough.
We started out as a one party system. George Washington being the first president would arbitrate between factions in the House and Senate. When he died the people on opposite sides branched into two parties - the Federalist Party, created largely by Alexander Hamilton, and the rival Jeffersonian Democratic-Republican Party formed by Thomas Jefferson and James Madison and usually called at the time the "Republican Party." The Federalists were dominant until 1800, while the Republicans were dominant after 1800.
This is how the two party system started.