(Toby Melville | The Associated Press) U.S. Secretary of State Rex Tillerson, right, and Woody Johnson, U.S. ambassador to Britain stand outside the new U.S. embassy in London, Monday Jan. 22, 2018. Secretary of State Rex Tillerson has become the highest-ranking U.S. official to visit the new American embassy in London, a building that President Donald Trump derided for its cost and location.