Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE and Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE are in a tight race in Pennsylvania, according to a new Public Policy Polling survey.

Clinton leads Trump in a matchup by just 1 point, 41 to 40 percent. Libertarian presidential nominee Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE garners 6 percent support in the poll, and Green Party candidate Jill Stein gets 3 percent.

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In a head-to-head matchup between both presumptive presidential nominees, Clinton and Trump tie at 44 percent.

But Republicans are more unified around Trump than Democrats are around Clinton, according to the poll, which was conducted before Clinton clinched the nomination.

Democratic presidential candidate Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE holds a larger lead over the presumptive GOP nominee in a matchup. Sanders has 45 percent of the vote, compared to Trump's 36 percent. Johnson has 5 percent support in the matchup, and Stein takes 1 percent.

In a head-to-head matchup between Trump and Sanders, Sanders leads Trump 51 to 39 percent.

Among those who support Sanders in a head-to-head matchup with Trump, 72 percent say they would support Clinton and 10 percent say they would support Trump. The remainder of Sanders supporters say they would support Stein, Johnson or are undecided.

Clinton would hold a more comfortable lead over Trump in the state if she could win over Sanders supporters, according to the poll.

Trump also has a high unfavorable rating in the state. Only 34 percent of voters view him favorably and 59 percent have a negative opinion of the candidate.

The survey was conducted among 1,106 registered voters from June 3 to 5. The margin of error is 3 percentage points.

The survey was conducted before Hillary Clinton became the Democratic party's presumptive nominee. Now, Clinton is looking to garner the backing of Sanders supporters as she pivots to the general election. But the Vermont senator has vowed to stay in the race and fight for every vote and delegate.