A new poll shows GOP 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 leading his rivals in California by 18 points.

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A Capitol Weekly/Sextant Strategies poll shows Trump with 41 percent support and 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 trailing with 23 percent. John Kasich has 21 percent, and 15 percent of Republicans say they remain undecided.

Of those who said they would vote for Cruz, 69 percent said they strongly support him while 26 percent said their support is aimed at preventing Trump from becoming the nominee. Thirty-four percent of Kasich supporters said their vote was anti-Trump.

Nearly half of those polled, 47 percent, said they believe Trump will be the nominee regardless of their preferred candidate. Twenty-four percent said someone not currently running will be the nominee, and only 22 percent think Cruz will be the nominee.

Forty-two percent of people said that if Trump wins the most delegates before the Republican National Convention, but not a majority, another candidate should be allowed to take the nomination. Forty-eight percent of people said Trump should be the nominee if he leads the delegate count.

California is an important contest for the all the candidates as Cruz and Kasich work to stop Trump from reaching the 1,237 delegates necessary to clinch the GOP nomination before the convention in July.

The state will award 172 delegates when it votes June 7. The winner of each of the state’s 53 congressional districts will receive three delegates, and the statewide winner will get 13.

The poll was conducted among 1,165 registered Republicans.

The results of this poll are similar to a CBS News/YouGov poll released Sunday that showed Trump leading Cruz by 18 points, 49 percent to 31 percent. Kasich has 16 percent support in that poll.