Since the Democrats as a Party declared themselves as actively 'Resistant' to anything and everything he does, no matter what, why would he cooperate? What incentive does he have? It's kind of silly to expect him to cooperate, especially when we all know if they vote for impeachment it will blow up in their faces like all of their previous claims and actions; the Senate is not going to remove him from office, and probably won't even pay any attention to the demand. They gave away 2020 to Trump with their open admission of favoring illegal aliens over citizens in their fake 'Debates' on national TV. One doesn't have to be a partisan to see the obvious here.
No such declaration exists. Trump has played the imperial president from day 1. Trump has been noncooperative from the beginning.