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Donald Trump speaks at a news conference in Washington, March 21, 2016. Jim Bourg/Reuters

Republican presidential hopeful Donald Trump Sunday threatened to sue the Republican Party over the way delegates are being awarded in the Louisiana Primary.

Trump won the popular vote in the March 5 contest, tallying 124,818 votes to 113,949 for Texas Sen. Ted Cruz, 33,805 for Marco Rubio, who has since dropped out of the race for the GOP presidential nomination, and 19,355 for Ohio Gov. John Kasich.

The party initially awarded Cruz and Trump 18 delegates each, with five going to Rubio. The Wall Street Journal reported Rubio’s delegates likely will go to Cruz along with five unbound delegates as party leaders mount an effort to keep Trump from gaining the 1,237 needed to secure the nomination.

“Just to show you how unfair Republican primary politics can be, I won the state of Louisiana and get less delegates than Cruz,” the New York real estate mogul tweeted Sunday, threatening to sue over the issue.

Earlier in the day in an appearance on ABC’s “This Week,” Trump called the Republican system for awarding delegates “crooked” and “rotten.”

“I have millions of votes more than Lyin’ Ted Cruz and he’s trying to steal things,” Trump said. “What’s going on in the Republican Party is a disgrace.”

Trump currently leads his rivals in the delegate count. He has 739 to 465 for Cruz and 143 for Kasich. Concern, however, mounted last week as polls indicated both Democrats Hillary Clinton and Bernie Sanders would beat Trump in head-to-head matchups come November, in some cases by double digits.

Trump discounted the polls, saying he is confident he would beat Clinton.

The other candidates Sunday deplored the level to which the campaign has fallen in the last week, with Trump and Cruz exchanging charges related to their wives.

Secretary of State John Kerry, in an appearance on CBS’ “Face the Nation,” said the campaign has become an embarrassment.

“Everywhere I go, every leader I meet, they ask about what is happening to America,” Kerry said. “They can’t believe it. They are shocked.”

Trump also said he would stop tweeting so much if he’s elected president.