U.S. foreign policy will be dictated by President-elect Donald Trump. It will be influenced by Trump’s pick for national security adviser, U.S. Rep. Mike Waltz, R-Fla. And policy will be implemented by U.S. Sen. Marco Rubio, R-Fla., once he’s confirmed as secretary of state. A fourth Floridian also will have a role. Less known than the others, U.S.