Sen. Marco Rubio, R-Fla., won the Puerto Rico Republican primary Sunday, giving his presidential campaign a badly needed boost on a weekend already mired by losses.

It wasn’t clear how many delegates Rubio had when the Associated Press called the race for the senator Sunday afternoon. He traveled to Puerto Rico on Saturday for a series of last-minute appearances in hopes of shoring up support.

The win is likely to give Rubio all of the island’s 23 delegates as he seeks to at least stall Donald Trump’s fight to become the Republican presidential nominee.

Puerto holds a “winner-take-most” primary, meaning that some delegates may go to runners-up, depending on the final vote tally.

The win came after a miserable Saturday for Rubio. He placed third behind Trump and Sen. Ted Cruz, R-Texas, in contests held in Kansas, Kentucky and Louisiana, and fourth in Maine behind Trump, Cruz and Ohio Gov. John Kasich.

Trump still leads the pack with 382 delegates, while Cruz has 300 delegates, according to an AP tally.

Rubio will have 151 delegates if he wins every available slot in Puerto Rico.

At least 1,237 delegates are needed to secure the Republican Party’s presidential nomination.

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