Trump’s interest in buying Greenland seemed like a joke. Then it got ugly.

“This is yet another blow to American credibility under President Trump,” said Ivo H. Daalder, a former ambassador to NATO under President Barack Obama. “No leader, friend or foe, will take America seriously.”

“It’s not just the unthinkable notion of buying and selling territory as if we’re talking about a building or golf course,” he added. “It’s also the abrupt cancellation of a state visit as a result of the totally predictable rejection of that notion.”…

The dust-up could have wider ramifications, analysts said. “The president’s anger and his menacing tweet about Danish defense spending reignites Europeans’ worst fears about the U.S. commitment to NATO,” said Constanze Stelzenmüller, a German scholar at the Brookings Institution. “Presumably, the administration isn’t considering foreclosure. But is selling our territory now a proof of fealty for President Trump?”…

It fell to Secretary of State Mike Pompeo to do damage control, calling his Danish counterpart, Jeppe Kofod, to express “appreciation for Denmark’s cooperation as one of the United States’ allies,” according to Ms. Ortagus.