Trump: Obama is not a natural dealmaker
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GOP nominee Donald TrumpDonald John TrumpTrump calls Sri Lankan prime minister following church bombings Ex-Trump lawyer: Mueller knew Trump had to call investigation a 'witch hunt' for 'political reasons' The biggest challenge from the Mueller Report depends on the vigilance of everyone MORE slammed President Obama for failing reach a deal Monday with Russian President Vladimir Putin on a cease-fire for Syria.

In a tweet, Trump said Obama is “not a natural deal maker” and “only makes bad deals.” 

Obama had an informal 90-minute meeting with Putin before the end of the G-20 summit in China on Monday.

The White House said Obama instructed Secretary of State John KerryJohn Forbes KerryTrump: 'Iran is being given very bad advice by John Kerry' Trump removes sanctions waivers on countries buying oil from Iran Buttigieg to fundraise in DC with major Obama, Clinton bundlers next month: report MORE and foreign Minister Sergey Lavrov to keep working on an agreement to reduce violence in Syria.