Marco Rubio actually said...
Yes, as laid out clearly in the President's National Security Strategy, we recognize that the People's Republic of China (PRC) is the greatest geopolitical challenge that we face, because it is the only competitor with the intent to reshape and remake the international order, and increasingly has the economic, diplomatic, military, and technological capability to do so.
Context
Rubio identifies China as the greatest geopolitical challenge to the U.S.
06/22/2022