welcome back. president trump's trip to england is starting off with a bang. the president injected himself into british politics by endorsing mayor boris johnson to be the next prime minister and urged the country to walk away with its brexit negotiations from the eu, also calling meghan markle, the duchess of sussex, nasty. minutes before touching down, the mayor, quote, is a stone-cold loser. that's how he began a trip that's supposed to highlight the special relationship between the u.s. and the uk. hallie jackson is nbc news'