That's simply false. They have, over and over, come to the table to work with Trump. It's a point of frustration for me considering how little compromise they have been able to achieve.
I would respect Democrats more if they had a "F.U. moment" and did something like arresting and imprisoning executive employees under the capitol building for contempt of Congress, for failure to produce documents necessary for oversight, that are required by law to be furnished on demand.
In the 2015 parlance of Back to the Future Part 2, they "got no scrote".