Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE and Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE lead their rivals nationally as five states head to the polls on Tuesday, a new poll finds.

A new NBC News/SurveyMonkey weekly online poll found Trump with a 20-point lead over GOP rival Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE, 44 to 24 percent.

The GOP front-runner held his lead among most voter groups, but Republican voters who consider themselves “very conservative” backed Cruz over Trump by a narrow margin.

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Ohio Gov. John Kasich jumped to third place, with 12 percent, edging out Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE by 1 point. The Florida senator dropped 7 points and now sits in last place.

Both Kasich and Rubio are hoping to score Tuesday victories in their home states of Ohio and Florida, respectively, to try to beat back the growing presence of Trump as the front-runner.

On the Democratic side, Clinton still leads Sanders, 54 percent to 41 percent. But he slightly closed the gap from last week’s poll by 4 points.

The former secretary of State holds a slim lead over Sanders among overall male voters but edges him out by 20 points among women. But Sanders outperforms her among female voters under age 30.

The poll was conducted from March 7 to 13 and surveyed 2,280 registered GOP voters and 2,597 registered Democratic voters. The margins of error were 3.1 points and 2.7 points, respectively.