Tensions between the U.S. and China have been rising for some time now, and Rubio's appointment has widely been seen as a sign that Trump plans to maintain a hard line on China during his second term. One of the most outspoken China hawks in Washington, Rubio has introduced several bills targeting the Chinese Communist Party.

Secretary of State Marco Rubio is expected to head to Panama soon for his first international trip as the nation’s top diplomat, Fox News has learned.