President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's national security adviser on Thursday said that he discussed increasing economic ties with Greenland during a meeting with the U.S. ambassador to Denmark.

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John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE tweeted a photo with Ambassador Carla Sands at the White House. The two discussed "Arctic and energy security, trade, and boosting US economic ties with Greenland, including investments in mineral exploration projects and airport upgrades."

Great discussion with @USAmbDenmark on deepening ties with Denmark, Greenland, and the Faroe Islands. Topics included Arctic and energy security, trade, and boosting US economic ties with Greenland, including investments in mineral exploration projects and airport upgrades. pic.twitter.com/L5T1d9IrXr — John Bolton (@AmbJohnBolton) September 5, 2019

The meeting came days after President Trump was supposed to meet with Danish leaders in Copenhagen. But the president abruptly canceled the trip last month after Danish and Greenlandic officials rejected the possibility of the U.S. purchasing Greenland.

The president had privately mused about buying the island, which is an autonomous Danish territory, and later said it made sense as a "strategic" purchase.

A few Republican lawmakers have since voiced their support for the idea.

Danish Prime Minister Mette Frederiksen called the idea "absurd" and said she hoped Trump did not mean it seriously.

After Trump said the prime minister's comments were "nasty" and "inappropriate," the two spoke on the phone and the president praised her as a "wonderful woman."