A handout picture provided by the office of Iranian President Hassan Rouhani on August 2, 2016 shows him giving a televised speech from an undisclosed location in Iran. President Hassan Rouhani said that Washington had missed an opportunity to settle regional issues with Tehran by ignoring its commitments under the nuclear deal between Iran and world powers. / AFP PHOTO / IRANIAN PRESIDENCY / HO / = RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / HO / IRANIAN PRESIDENCY " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS ===HO/AFP/Getty Images

A handout picture provided by the office of Iranian President Hassan Rouhani on August 2, 2016 shows him giving a televised speech from an undisclosed location in Iran. President Hassan Rouhani said that Washington had missed an opportunity to settle regional issues with Tehran by ignoring its commitments under the nuclear deal between Iran and world powers. / AFP PHOTO / IRANIAN PRESIDENCY / HO / = RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / HO / IRANIAN PRESIDENCY " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS ===HO/AFP/Getty Images

Senior Advisor and Assistant to US President Barack Obama Valerie Jarrett speaks to former US Secretary of State Henry Kissnger at the start of a state lunch welcoming Singapore Prime Minister Lee Hsien Loong in Washington, DC on August 2, 2016. / AFP PHOTO / ZACH GIBSONZACH GIBSON/AFP/Getty Images

US Vice President Joe Biden speaks next to US Secretary of State John Kerry during a luncheon with Singapore Prime Minister Lee Hsien Loong at the US Department of State in Washington, DC on August 2, 2016. / AFP PHOTO / ZACH GIBSONZACH GIBSON/AFP/Getty Images

Vice President Joe Biden toasts to Singapore Prime Minister Lee Hsien Loong during a state lunch at the US Department of State in Washington DC, on August 2, 2016, as US Secretary of State John Kerry looks on. / AFP PHOTO / ZACH GIBSONZACH GIBSON/AFP/Getty Images

Singapore Prime Minister Lee Hsien Loong toasts to US Secretary of State John Kerry, and Vice President Joe Biden during a state lunch at the US Department of State in Washington DC, on August 2, 2016. / AFP PHOTO / ZACH GIBSONZACH GIBSON/AFP/Getty Images

Singapore Prime Minister Lee Hsien Loong toasts to US Secretary of State John Kerry, and Vice President Joe Biden during a state lunch at the US Department of State in Washington DC, on August 2, 2016. / AFP PHOTO / ZACH GIBSONZACH GIBSON/AFP/Getty Images

Singapore's Prime Minister Lee Hsien Loong holds a baby as he and U.S. President Barack Obama greet invited guests during an official arrival ceremony on the South Lawn of the White House in Washington, U.S. August 2, 2016. REUTERS/Jonathan Ernst