President Trump vows 'America First' in speech

U.S. President Donald Trump takes the oath of office as his wife Melania holds the bible and his children Barron, Ivanka, Eric and Tiffany watch as US Supreme Court Chief Justice John Roberts (R) administers the oath during inauguration ceremonies swearing in Trump as the 45th president of the United States on the West front of the US Capitol in Washington, DC, US, January 20, 2017. [Photo/Agencies]