VATICAN CITY (Reuters) - President Donald Trump arrived at the Vatican on Wednesday for talks with one of his most high-profile critics, Pope Francis, after the two men exchanged sharp words during the presidential campaign last year. Under clear blue skies, Trump received a tribute from the Swiss Guard in a Vatican courtyard where he was greeted by Archbishop Georg Ganswein, the prefect of the pontifical household. Trump looked uncomfortable as he entered a small elevator taking him to the third floor of the Apostolic Palace, where he was accompanied by Ganswein and other officials along a frescoed corridor to the pope’s private study. Following behind Trump were daughter Ivanka, her husband, Jared Kushner, a top White House aide, national security adviser H.R.