 During this process, a self-professed left leaning registered Democrat and Biglaw partner explained his reasons for supporting Cooper.He described Cooper as “thoroughly devoted to drawing principled constitutional lines,” “an immovable rock” for upholding the rule of law, and “one of the most principled lawyers you’ll ever encounter.” 

Cooper has argued seven cases in front on the United States Supreme Court.Virginia Uranium v. Warren

On Number 6, 2018, Cooper argued "Virginia Uranium v. Warren".