President Trump trails former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE, Sen. 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 (I-Vt.) and three Democratic senators in a new poll from a Democratic firm testing possible 2020 matchups.

The survey of registered voters, conducted by Public Policy Polling, found Trump trailing by wide margins against Sanders — 52 percent to 39 percent — and Biden — 54 percent to 39 percent.

The poll also found Trump losing in hypothetical matchups against Sens. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.), Cory Booker (D-N.J.) and Kamala Harris (D-Calif.), although by smaller margins.

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Trump trails Warren by 7 points, 42 percent to 49 percent; Booker by 5 points, 40 percent to 45 percent; and Harris by 1 point, 40 percent to 41 percent.

In a hypothetical race against Facebook CEO Mark Zuckerberg, Trump would see a tie, 40 percent to 40 percent.

The poll surveyed 836 registered voters between July 14 and 17 and has a margin of error of 3.4 percentage points.

The president has faced consistently low approval ratings since taking office in January. The Public Policy Polling survey pegged his current job approval at 41 percent, narrowly higher than the RealClearPolitics polling average of 40.3 percent.

While former President Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE exhausted his two-term limit, 53 percent of respondents in the poll said that they wish he were still the nation's chief executive instead of Trump.

Likewise, 49 percent said they wish former Democratic presidential candidate 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 were in the White House in place of Trump.

Another poll by Bloomberg, however, found Clinton is less popular than Trump.

It found that 58 percent of Americans have a negative view of Clinton, compared to 55 percent for Trump.