There have been a spate of major demonstrations on college campuses from California to Massachusetts over the past week
The notion of purchasing the icy, autonomous Danish territory between the North Atlantic and Arctic oceans has been laughed off by some advisers as a joke but taken more seriously by others, the sources said.
The idea of a Greenland purchase was first reported by the Wall Street Journal. President Harry Truman had offered to buy Greenland in 1946 for $100 million.
Trump, who is on a working vacation at his golf club in Bedminster, New Jersey, is to make his first visit to Denmark early in September.
There has been no indication that a Greenland purchase will be on the agenda for his talks with Danish officials.
Thule Air Base in Greenland is the US military’s northernmost installation.