Marco Rubio was elected to the Senate in 2010, and has previously taken a hard stance on China, Iran, Venezuela and Cuba.
He was also considered a top pick to become Mr Trump's vice-president until Senator JD Vance was announced as the president-elect's running mate.
According to the New York Times, he has become one of the most outspoken senators when it comes to the need for the US to be more aggressive in its dealings with China.