President Trump has arrived in London for an official state visit to the United Kingdom. Just before arriving, Trump slammed the mayor of London who has been a vocal critic of his.

According to Fox News:

President Trump mixed high-level diplomacy with schoolyard taunts as he arrived early Monday morning at Buckingham Palace as part of a packed overseas agenda that includes an audience with Queen Elizabeth II and D-Day commemoration ceremonies.

At the palace in London, the president and first lady Melania Trump had a private lunch with the Queen, after being greeted by Prince Charles and his wife Camilla, the Duchess of Cornwall.

Trump could be seen chatting with members of the Guard of Honor as the rest of the American delegation, from a terrace, observed the elaborate arrival ceremony, complete with the playing of “The Star-Spangled Banner.” Royal gun salutes were fired from nearby Green Park and from the Tower of London as part of the pageantry accompanying an official state visit.

Juxtaposed against that scene, however, was an opening scrap between Trump and London Mayor Sadiq Khan, who penned a critical column of the president he called a “global threat.” In the column titled, “It’s un-British to roll out the red carpet for Donald Trump,” Khan listed Trump’s most controversial policies and likened them to the actions of European dictators of the 1930s and 40s.

….Kahn reminds me very much of our very dumb and incompetent Mayor of NYC, de Blasio, who has also done a terrible job – only half his height. In any event, I look forward to being a great friend to the United Kingdom, and am looking very much forward to my visit. Landing now!

— Donald J. Trump (@realDonaldTrump) June 3, 2019

President Trump has made clear that he looks forward to this trip and strengthening this relationship with the United Kingdom.