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US President Barack Obama (R) greets Italian Prime Minister Matteo Renzi (L) after offering a toast during a state dinner on the South Lawn of the White House in Washington DC, USA, 18 October 2016. President Obama hosts his final state dinner, featuring celebrity chef Mario Batali and singer Gwen Stefani performing after dinner. WASHINGTON, DC - OCTOBER 18: U.S. President Barack Obama greets Italian Prime Minister Matteo Renzi after offering a toast at a state dinner on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner, with singer Gwen Stefani performing. (Photo by Michael Reynolds-Pool/Getty Images)

US President Barack Obama (R) greets Italian Prime Minister Matteo Renzi (L) after offering a toast during a state dinner on the South Lawn of the White House in Washington DC, USA, 18 October 2016. President Obama hosts his final state dinner, featuring celebrity chef Mario Batali and singer Gwen Stefani performing after dinner.  WASHINGTON, DC - OCTOBER 18:  U.S. President Barack Obama greets Italian Prime Minister Matteo Renzi after offering a toast at a state dinner on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner, with singer Gwen Stefani performing.  (Photo by Michael Reynolds-Pool/Getty Images)