Why, because it runs counter to the current groupthink? I challenge you to think for yourself and consider who in the executive department has the legal authority to refuse any lawful order from the president. Not one single person has that authority. The last one who tried was then-Acting Deputy Attorney General Sally Yates, and she was fired immediately by President Trump.
Ignore the theatrics, which are intended to deflect from what is actually happening. When President Trump wants the demanded items released, they will be released.