WASHINGTON (AP) -- Donald Trump and Hillary Clinton are engaged in their first full-blown Twitter war.
Trump started it, mocking President Barack Obama's endorsement of the presumptive Democratic nominee on Thursday.
But Clinton's campaign responded with an epic troll. "Delete your account," her campaign wrote.
The message quickly went viral, getting retweeted 130,000 times in about an hour. It was a campaign milestone: Clinton's most retweeted tweet.
Trump, who's known for his brash voice on the site, shot back with his own missive.
"How long did it take your staff of 823 people to think that up--and where are your 33,000 emails that you deleted?" he wrote.
It was a reference to Clinton's email scandal and her far larger campaign staff.
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