US President Donald Trump had a “fiery” and contentious phone call with Danish Prime Minister Mette Frederiksen last week, during which Trump insisted he was serious about taking over Greenland, European officials told the Financial Times. The officials, who were not identified by the FT, said the conversation had gone very badly, with one describing it as “horrendous.” Another official said that Trump’s intention to take over Greenland was “serious, and potentially very dangerous.” For weeks, Trump has voiced his interest in taking over Greenland, the Panama Canal, and Canada, in what analysts say reflect his hardball diplomacy. Frederiksen has...