It has been nearly 80 years since the United States expanded its territory, and there are increasing signs that President Donald Trump intends to change that. After what seemed in his first term like a lark about claiming Greenland, Trump has doubled down on that and other expansionist ideas.

President Trump said of the Panama Canal, “We’re taking it back.” The letter from Panama cited articles of the U.N. charter that prohibit member states from using threats and force.

Panama has reportedly submitted a formal letter to the U.N. rejecting Trump's statement about reclaiming the canal. The country's President José Raúl Mulino said in the letter, dated January 20, that the canal "is and will continue to be Panama's," the New York Times reported.

Panama President José Raúl Mulino has directly addressed President Donald Trump 's controversial comments regarding the Panama Canal, reaffirming that the waterway unequivocally belongs to Panama.

Marco Rubio will travel to Panama on his first trip abroad as secretary of State. The visit comes as Donald Trump looks to reclaim Panama's canal.

Panama has alerted the United Nations - in a letter seen by Reuters on Tuesday - to U.S. President Donald Trump's remarks during his inauguration speech, when he vowed that the United States would take back the Panama Canal.

In his inaugural speech, President Donald Trump repeated his plan to regain control of the Panama Canal. Can he?

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Marco Rubio will head overseas late next week; he's also scheduled to visit Guatemala, El Salvador, Costa Rica and the Dominican Republic.

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They say they fought too hard to wrest it from the U.S. to now hand back the waterway, which is part of the nation’s identity.