It's a long-distance feud, transmitted over the airwaves and on social media, that's now devolved well beyond a small political spat.

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CNN looks at the relationship between Barack Obama and Donald Trump.

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The contrast could not be more extreme: a loud, pushy, anti-intellectual President Donald Trump versus a soft-spoken, recessive, philosophical former president, Barack Obama. The difference has become especially glaring in recent days, with Trump repeatedly breaking the tradition of a new president refraining from dissing his predecessor.

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President Donald Trump continues to criticize former President Barack Obama for his response to alleged Russian interference in the 2016 election. CNN's Sara Murray reports.

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Donald Trump has a new favorite target -- the guy who used to have his job.

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The top Democrat on the House intelligence committee said that if President Donald Trump doesn't act on the threat Russia poses, he could be derelict in his duty to protect the United States.

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Former Trump campaign chairman Paul Manafort filed documents with the Justice Department showing his consulting firm was paid more than $17 million between 2012 and 2014 for work on behalf of a pro-Russia political party in Ukraine. 

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A cyber security researcher found a "temporary vaccine" to ransomware after hearing about an attack in the news. CNN's Oren Liebermann reports

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Hours after telling reporters they would be allowed to cover President Donald Trump's first re-election fundraiser in Washington on Wednesday, the White House abruptly switched course, closing the event to media in a break from past precedent.

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What stands out most when you enter the Old City of Mosul is the smell.

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When compared with their white peers, young black girls are viewed less as children and more like adults, according to a new research report.

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One hundred eleven people died last year under California's new right-to-die law, according to a report released Tuesday by the state's Department of Public Health.

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During a congratulatory call to the newly-elected PM of Ireland, US President Donald Trump spoke of a RTE reporter's "nice smile"

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