"The House committee’s work has been deeply, and perhaps irreparably, undermined by Nunes’ apparent coordination with the White House."
Fudge
What I read was that someone in a security outfit that is located in the White House informed Nunes that they had some critical material and he went to see it.
It was of a nature that when he saw it he thought the President's office should be made aware of it.
He then went public and was quite open about the situation. He also arranged for Schiff to see it if he wanted to.
When you use the word "coordination", I think that you imply an ongoing premeditated strategy of deception.