Republican presidential front-runner 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 is above the 50 percent mark nationally in an online tracking poll.

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The billionaire businessman added 4 points to reach 50 percent in the latest NBC News/SurveyMonkey weekly poll, released Tuesday morning.

It’s the first time he’s reached the threshold since the poll launched late last year.

He’s been in the high 40s since the middle of last month.

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 lost 2 points in the latest poll to fall to 26 percent, while John Kasich is at 17 percent, also down 2 points.

The poll of 10,707 adults, conducted April 18–24, has a reported margin of error of 1.4 percentage points.