Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE and Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE are neck and neck in three swing states ahead of their potential general presidential election match-up, according to a new poll.

Clinton and Trump are deadlocked in Ohio, Florida and Pennsylvania, according to the Quinnipiac University survey released early Tuesday.

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“Six months from Election Day, the presidential races between Hillary Clinton and Donald Trump in the three most crucial states, Florida, Ohio and Pennsylvania, are too close to call,” said Peter A. Brown, assistant director of the Quinnipiac University poll.

“At this juncture, Trump is doing better in Pennsylvania than the GOP nominees in 2008 and 2012. And the two candidates are about where their party predecessors were at this point in Ohio and Florida.”

Clinton leads Trump by 1 point in Florida, 43 to 42 percent, for the GOP’s presumptive presidential nominee.

She also edges Trump in Pennsylvania, with 43 percent to the billionaire’s 42 percent.

Trump has a slightly larger lead over Clinton in Ohio, however, notching 43 percent to the Democratic presidential front-runner’s 39 percent.

Quinnipiac University questioned 1,051 Florida voters from April 27 to May 8. Its poll has a margin of error of 3 percentage points.

Its latest survey of 1,042 Ohio voters took place during the same time period and has a margin of error of 3 percentage points. The polling firm’s sampling of 1,077 Pennsylvania voters also has a margin of error of 3 points.

Clinton leads Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) by nearly 6 points nationwide, according to the latest RealClearPolitics average of polls.

Trump, meanwhile, became the presumptive GOP presidential nominee after a strong showing in Indiana’s Republican primary last week, knocking rivals Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE and John Kasich out of the race.