President Trump arrived for a NATO reception at 10 Downing Street a few minutes ago, with French President Emmanuel Macron, having apparently given the French President a ride.

He waited a few minutes and then entered with first lady Melania Trump.

Trump and Macron have had a tense day: It started when Macron described the long-time coalition as suffering from "brain death" in part due to a lack of US leadership under Trump. Trump called those comments "insulting." Later, the two held a news conference, where Macron corrected Trump about ISIS fighters.

What's happening at the reception: A choir ran through Christmas songs as guests began arriving, including Hark the Herald Angel, Walking in a Winter Wonderland and We Wish You a Merry Christmas.

Jens Stoltenberg, Secretary General of NATO, was first to arrive followed shortly after by Canadian Prime Minister Justin Trudeau, then German Chancellor Angela Merkel, who stopped to admire the choir.

The NATO leaders are attending a reception hosted by British Prime Minister Boris Johnson, and had come from a separate reception hosted by Queen Elizabeth at Buckingham Palace.