That has not muted President Donald Trump’s zeal for acquiring the world’s largest island and on Wednesday he doubled-down on his real estate DNA to buy, buy, buy. “The United States needs Greenland for the purpose of National Security,” Trump posted on social media hours before the top diplomats from Greenland and Denmark met for about 90 minutes at the White House with Vice President J.D. Vance and Secretary of State Marco Rubio. “Anything less than that is unacceptable.”