“Even assuming that the IGA comports with Article II, Plaintiffs’ inability to perform their duties for 30 days is not irreparable harm. Moreover, if the IGs were reinstated, the President could lawfully remove them after 30 days by providing the required notice and rationale to Congress.”

The “irreparable harm” is that the president is being allowed to break the law without consequence. Reinstate them, and if he wants to fire them again, make him do it.