Trump blasts poll showing Clinton with a 12-point lead
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Donald TrumpDonald TrumpTexas announces election audit in four counties after Trump demand Schumer sets Monday showdown on debt ceiling-government funding bill Pennsylvania AG sues to block GOP subpoenas in election probe MORE on Sunday dismissed a poll that shows rival Hillary ClintonHillary Diane Rodham ClintonHeller won't say if Biden won election Whitmer trailing GOP challenger by 6 points in Michigan governor race: poll GOP political operatives indicted over illegal campaign contribution from Russian national in 2016 MORE leading him nationally by 12 points. 

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"The @ABC poll sample is heavy on Democrats. Very dishonest - why would they do that? Other polls good!" the presumptive Republican presidential nominee tweeted.

The ABC News/Washington Post poll shows Clinton with 51 percent support among likely voters and Trump with 39 percent. 

The poll surveyed 1,001 adults reached on cellphones and landlines, according to the Post

Of those surveyed, 36 percent identify as Democratic, up 3 points from a May version of the poll. Republicans accounted for 24 percent of those polled this month, down 1 percentage point from the May poll. Independents made up 33 percent of those surveyed. 

The Post notes that the shift in party identification accounts for less than half of Clinton's gain in the new poll. 

The poll comes on the heels of a Reuters/Ipsos poll showing Clinton with a 14-point lead nationally. 

An NBC News/Wall Street Journal poll released Sunday gave Clinton a smaller lead, 5 points, over Trump.