Rubio's interest in Latin America stems from his Cuban heritage and he has acquired unmatched personal relationships and knowledge of the region while serving as the top Republican in key committees overseeing foreign policy.

Florida Sen. Marco Rubio, a Catholic, is President-elect Donald Trump’s choice for the key post of U.S. secretary of state.

Trump could still change his mind, the sources cautioned, noting that the decision wouldn’t be finalized until the president-elect makes a formal announcement.