Usha Vance, the wife of US vice-president JD Vance, will travel to Greenland this week as President Donald Trump clings to the idea of a US annexation of the strategic, semi-autonomous Danish territory. Vance will visit Greenland on Thursday with a US delegation to tour historical sites, learn about the territory’s heritage and attend the national dogsled race, the White House said in a statement. The delegation will return to the US on 29 March. The White House national security adviser, Mike Waltz, and the energy secretary, Chris Wright, will also travel to Greenland, visiting a US military base in