Republican presidential candidate 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 widening his lead in the GOP race, according to the latest national poll released Thursday.

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Trump gets the support of 45 percent of likely GOP primary voters in a new Fox News poll, followed by 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, with 27 percent, and John Kasich, with 25 percent.

Trump had just a 3-point lead over Cruz in the same poll conducted in March, when Cruz previously held 38 percent of the vote.

The results are in line with other national polls. A CBS News poll released Thursday shows Trump with a 13-point lead over Cruz.

According to a RealClearPolitics average of all national polls, Trump has a 10-point lead on Cruz with 40 percent support to Cruz’s 30 percent.

The Fox News poll was conducted April 11–13 among 419 registered Republicans with a margin of error of 4.5 percent.