The margin between presidential candidates Joe Biden and Donald Trump ahead of the November election is razor thin, with one in five voters saying they could change their minds, according to a new poll. 

A national poll conducted by Quinnipiac University shows President Joe Biden and former President Donald Trump locked in a neck-and-neck race, with Biden receiving 48% support and Trump right behind him with 47% support.

In a poll where independent and Green Party candidates are added to the presidential lineup, Biden receives 41%, Trump receives 38%, independent candidate Robert F. Kennedy, Jr., receives 14%, and Green Party candidate Jill Stein receives 2% support.

However, 19% of voters who chose a candidate in the matchup with third-party candidates say it's very likely (3 percent) or somewhat likely (16 percent) that they could change their minds about their presidential choice before the election, while 80% said it is either not so likely (12 percent) or not likely at all (68 percent) that they will change their minds before November.

Tim Malloy, a Quinnipiac University polling analyst said, "call them fair weather; call them unsure. A sizeable block of registered voters is still juggling candidates, with Kennedy voters particularly swayable and Trump voters less inclined to bail on their candidate."

Key voting issues were also taken into account.

Voters were asked for their opinions regarding several talking points, including the Israel-Hamas war in Gaza, prejudice against Jewish and Muslim Americans, US involvement with Ukraine in the Russia-Ukraine war, abortion rights, economic statistics, and immigration policies.

A televised debate between President Biden and former President Trump is scheduled for late June.