President Biden and former President Trump are tied in a new survey testing the two White House hopefuls in a head-to-head match-up.

The Marquette Law School poll found Biden and Trump with 50 percent support each among registered voters surveyed ahead of their expected November rematch.

When three third-party candidates — Robert F. Kennedy Jr., Jill Stein and Cornel West — are added into the mix, Trump pulls ahead with a 3-point lead. Kennedy siphons 17 percent of the vote, while Biden receives 37 percent to Trump’s 40 percent. 

That Trump lead is still within the poll’s margin of error, which sits at 4.6 percentage points, but the results nevertheless underscore concerns about how third-party candidates could tip a tight Biden-Trump rematch. 

Both Biden and Trump are now coasting to wins in their respective state primaries ahead of this summer’s party conventions, but their campaigns have continued to see protest votes that could hamper a path to victory for either. 

Trump’s former rival Nikki Haley has raked in big numbers in the GOP primaries in several states even weeks after dropping out of the race in March; and in Democratic primaries, progressives have cast “uncommitted” protest votes against Biden to voice upset over the Israel-Hamas war.

The former president is notably campaigning to get back to the White House as he faces multiple criminal indictments, including a trial in New York in which he’s accused of falsifying business records.

Fifty-four percent in the Marquette poll said they think Trump did something illegal in the case, 27 percent said he did something wrong but not illegal, and another 19 percent said he did nothing wrong.

The poll surveyed 902 registered voters May 6-15 and had a 4.6 percentage point margin of error.