Republican President Donald Trump won election in 2016 promising to put "America First," overturn what he said were unfair trade deals and force U.S. allies to pay more toward joint defense measures.

Two of the top national security officials President-elect Joe Biden named on Monday, Antony Blinken as secretary of state and Jake Sullivan as national security adviser, are known for collegiality, support for U.S. alliances and a reflex for using diplomacy as the tool of first resort.

Voters will not just be choosing between two candidates; they will opt for one of two divergent positions on foreign policy and defence