May 08, 2017
On Monday, May 8, 2017, the President signed into law:
H.R. 534, the "U.S. Wants to Compete for a World Expo Act," which authorizes the Secretary of State to take such actions as necessary for the United States to rejoin the Bureau of International Expositions.
Donald J. Trump, President Donald J. Trump Signs H.R. 534 into Law Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/327096