TO DEAL WITH. BUT THIS IS REALLY AN EXISTENTIAL THREAT. >> JOINING ME NOW, NBC'S SHANNON PETTYPIECE.ALSO HERE WITH US, HOFSTRA UNIVERSITY PROFESSOR OF LAW JAMES SAMPLE. SHANNON. THESE ARGUMENTS JUST WRAPPED UP I UNDERSTAND.GIVE ME THE HEADLINES. >> WELL. >> SO AT THE CENTER OF THIS IS WHETHER.>> OR NOT THE PRESIDENT HAS THE CONSTITUTIONAL AUTHORITY TO BE ABLE TO IMPOSE THESE TARIFFS, BECAUSE THE CONSTITUTION GIVES PRETTY CLEAR POWERS OF TARIFFS TO CONGRESS. BUT THE PRESIDENT IS TRYING TO USE THIS EXCEPTION, ...