April 18, 2014
On Friday, April 18, 2014, the President signed into law:
S. 2195, which amends current law to deny admission to the United States to any representative to the United Nations who the President determines has been engaged in terrorist activity against the United States or its allies and may pose a threat to U.S. national security interests.
Barack Obama, Statement by the Press Secretary on S. 2195 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/309970