Trump became the first sitting U.S. President to address the annual conclave of the rich and powerful at the Swiss ski resort of Davos for 18 years, closing the summit with a mostly upbeat speech that declared the United States "open for business". 

"Now is the best time to bring your money, your jobs, your businesses to America," he said, singling out tax cuts and curbs to regulation as boosting the investment climate. "The world is witnessing the resurgence of a strong and prosperous America." 

He said he would always promote "America First", as he expected other world leaders to do on behalf of their own countries, but added: "America First does not mean America alone. When the United States grows so does the world."