Even before a trio of prominent law professors officially filed a lawsuit against President Donald Trump over payments to his various businesses by foreign governments, several fellow academics said the suit has a fundamental problem.

Filing on behalf of the liberal watchdog group Citizens for Responsibility and Ethics in Washington (CREW) are University of California, Irvine School of Law dean Erwin Chemerinsky, Harvard Law School professor Laurence Tribe, and Fordham University School of Law professor Zephyr Teachout.