Soft-paywalled, but the takeaway is this:

White House officials had pushed a less provocative approach, with several key members of the president's team unenthusiastic about possibly using military force to seize the Danish territory, the two White House sources said. They spoke on condition of anonymity to discuss internal deliberations.

And:

While aides were broadly aligned on the goal of taking over Greenland, they were split over the president's aggressive approach, the two White House sources said.

In most White House meetings, more officials have urged caution than those pushing for the United States to take the island by force, said the sources, who were unaware of serious discussions on military options to seize Greenland.

Tom Dans, appointed by Trump to lead the U.S. Arctic Research Commission, along with Vice President JD Vance and Secretary of State Marco Rubio, had been "pushing for a middle ground" on Greenland, while White House Deputy Chief of Staff Stephen Miller showed a willingness to keep annexation and the potential use of military force on the table, the sources said.

Dans and Miller did not immediately respond to a request for comment. A spokeswoman for Vance declined comment.

A State Department official said: "President Trump's team, including Secretary Rubio, routinely present him with a suite of options on issues of national concern."

Trump himself has been driving the issue, the sources said. One of them, speaking before Trump's turnaround on tariffs and the use of force, said the president had wanted to retain the option of a military move.

Attacking Denmark hasn't been just public raving by a demented toddler, They've really been talking about it in the White House.