New NATO chief Mark Rutte met with UK Prime Minister Keir Starmer at Downing Street.Dan Kitwood/Getty ImagesNew NATO Secretary General Mark Rutte visited the UK on Thursday.Rutte met with UK Prime Minister Keir Starmer and Ukrainian President Volodymyr Zelenskyy."Stop worrying about a Trump presidency," Rutte told reporters outside Downing Street.Mark Rutte addressed the prospect of a second Trump presidency during his first official visit to London as NATO Secretary General on Thursday.Rutte, a former Dutch prime minister, was in the capital to meet with UK Prime Minister Keir Starmer and Ukrainian President Volodymyr Zelenskyy.Speaking to reporters outside 10 Downing Street, Rutte said: "I know that he (Trump) understands completely, and agrees with me that this fight in Ukraine is not only about Ukraine, it's also about the safety and the future security of the United States.