Poll: Clinton, Trump tied nationally
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Hillary ClintonHillary Diane Rodham ClintonGOP senator says idea that Ukraine interfered in US election is 'not a conspiracy theory' Cotton: Democrats are 'upset that their witnesses haven't said what they want them to say' Trump's troubles won't end with a Senate acquittal MORE and Donald TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE are in a dead heat in the race for the White House heading into their respective party conventions, according to a new national poll.

Trump and Clinton are tied at 40 percent support each in the CBS News/New York Times poll of adults released Thursday, with Clinton down 3 points and Trump up 3 points from last month.

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The vast majority of Trump and Clinton supporters say they've made up their minds, including 88 percent of Clinton supporters and 90 percent of Trump supporters.

The Republican and Democratic contenders remain tied when Libertarian nominee Gary JohnsonGary Earl JohnsonThe 'Green' new deal that Tom Perez needs to make The Trump strategy: Dare the Democrats to win Trump challenger: 'All bets are off' if I win New Hampshire primary MORE is added to the mix, with Trump and Clinton at 36 percent apiece and Johnson at 12 percent.

The poll was conducted after FBI Director James Comey criticized Clinton for mishandling classified information as secretary of State but declined to recommend criminal charges against her.

Most voters in the poll say Clinton did something wrong when she used a personal email setup for official work, including 46 percent who say what she did was illegal. More than three-quarters of Republicans view her actions as illegal. Half of independents also hold that view, and few Democrats say she broke the law.

Sixty-seven percent of those polled say Clinton is not honest and trustworthy, up 5 points in the past month. Just 28 percent view her as honest. Still, views of Trump aren't much better: 62 percent of voters don't think he's honest.

The survey of 1,600 adults including 1,258 registered voters was conducted July 8–12 via landlines and cellphones with a margin of error of 3 percentage points.