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This combination image of two photographs taken on September 5, 2016 shows, at left, US President Barack Obama speaking during a press conference following the conclusion of the G20 summit in Hangzhou, China, and at right, Philippine President Rodrigo Duterte speaking during a press conference in Davao City, the Philippines, prior to his departure for Laos to attend the ASEAN summit. 

US President Barack Obama on September 5 called a planned meeting with Rodrigo Duterte into question after the Philippine leader launched a foul-mouthed tirade against him.
 / AFP / Saul LOEB AND MANMAN DEJETO        (Photo credit should read SAUL LOEB,MANMAN DEJETO/AFP/Getty Images)
This combination image of two photographs taken on September 5, 2016 shows, at left, US President Barack Obama speaking during a press conference following the conclusion of the G20 summit in Hangzhou, China, and at right, Philippine President Rodrigo Duterte speaking during a press conference in Davao City, the Philippines, prior to his departure for Laos to attend the ASEAN summit. 

US President Barack Obama on September 5 called a planned meeting with Rodrigo Duterte into question after the Philippine leader launched a foul-mouthed tirade against him.
 / AFP / Saul LOEB AND MANMAN DEJETO        (Photo credit should read SAUL LOEB,MANMAN DEJETO/AFP/Getty Images)

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Philippine President expresses "regret" over comments

Philippines President Rodrigo Duterte has expressed his regret for the obscene language he used against President Barack Obama. CNN's Elise Labott and Hala Gorani report.

Philippine President expresses "regret" over comments

Philippines President Rodrigo Duterte has expressed his regret for the obscene language he used against President Barack Obama. CNN's Elise Labott and Hala Gorani report.