ABC News

As the Democratic presidential primary heats up, the question on everyone's mind is which candidate stands the best chance to defeat President Donald Trump in the 2020 general election.

According to a new poll released by Quinnipiac University, it's Trump who may have to worry whether or not he can beat any of the top tier candidates.

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US President Donald Trump waits to speak on the phone in the Oval Office at the White House in Washington, DC, on June 27, 2017. (Photo by Nicholas Kamm/AFP/Getty Images)

President Donald Trump's average approval rating has never risen above 50%, yet public support for his impeachment and removal from office has always remained low.

It looks like that's beginning to change.

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