Sir Keir told MPs “the future of Greenland is for the people of Greenland and the Kingdom of Denmark alone” – and said he would be hosting the Danish premier Mette Frederiksen in Downing Street on Thursday.
“President Trump deployed words on Chagos yesterday that were different to his previous words of welcome and support when I met him in the White House,” he said.
“He deployed those words yesterday for the express purpose of putting pressure on me and Britain in relation to my values and principles on the future of Greenland.”
The PM added: “He wants me to yield on my position, and I’m not going to do so.”
Conservative leader Kemi Badenoch said she supported the PM’s position on Greenland – but agreed with Trump on the “stupidity” of the Chagos Islands deal.
“We didn’t need President Trump to tell us that, we’ve been saying this for 12 months,” she told Sir Keir.
She urged the PM to “scrap this terrible deal and put the money into our armed forces”.
Later in the session, Labour MP Steve Witherden urged Sir Keir to “close ranks with our European allies and commit to retaliatory tariffs” against the US over Greenland.
“The thug in the White House has shown that he doesn’t listen to grovelling or sycophancy,” he said.
“He’ll continue to harm British interests no matter how compliant we are and, like all bullies, he will always find the weakest link.”
Downing Street refused to say that the US no longer supports the UK’s Chagos Islands deal, telling journalists “our Five Eyes allies support it”, a reference to the intelligence sharing alliance between the UK, Australia, Canada, New Zealand and the United States.
The UK signed the £3.4bn ($4.6bn) agreement in May, under which it would retain control of a UK-US military base on the largest of the islands, Diego Garcia.
