U.S. President George Bush is led by Singaporean President Wee Kim Wee, right, to the Istana Government House after a welcome ceremony in Singapore, January 4, 1992. (AP Photo/Dennis Cook)
President Barack Obama stands with Singapore Prime Minister Lee Hsien Loong, left, at a meeting of ASEAN, the 10-nation Association of Southeast Asian Nations, at the Annenberg Retreat at Sunnylands in Rancho Mirage, California, Monday, February 15, 2016. President Obama and the leaders of the Southeast Asian nations gathered for two days of talks on economic and security issues and on forging deeper ties amid China’s assertive presence in the region. (AP Photo/Pablo Martinez Monsivais)
U.S. Vice President Joe Biden, left, talks with former Singapore Prime Minister Lee Kuan Yew during their meeting at the Istana presidential palace in Singapore Friday, July 26, 2013. (AP Photo/Tim Chong, Pool)
Secretary of Defense Ash Carter and Singapore Minister of Defence Minister Ng Eng Hen are briefed on the capabilities of a P-8 during a flight over Singapore and the Strait of Malacca, June 3, 2016. Carter was in Singapore attending the 15th International Institute for Strategic Studies Asia Security Summit. (DoD photo by Navy Petty Officer 1st Class Tim D. Godbee)(Released)
Minister for Foreign Affairs Dr. Vivian Balakrishnan meets U.S. Secretary of State John Kerry in Washington, D.C., June 10, 2016.