Authorities of Panama and Greenland have repeatedly said they won’t hand over any territory to Trump, with Panama’s president declaring that the canal "is going to stay in our hands forever," and Denmark’s prime minister insisting “Greenland is not for sale.”

President-elect Donald Trump on Tuesday said he would not rule out the use of military force to seize control of the Panama Canal and Greenland, as he declared U.S. control of both to be vital to American national security.

President-elect Donald J. Trump is expected to deliver an announcement about economic development on Tuesday at Mar-a-Lago, his Florida estate. Mr. Trump is also likely to answer reporters’ questions. He has given one news conference since winning the election in November.