Marco Rubio Set to Win Puerto Rico's Republican Primary

With a quarter of the votes counted, Rubio had secured nearly 75 percent of the vote.

Republican presidential candidate Marco Rubio speaks to guests during a rally, January 6, 2016.

Marco Rubio will collect all 23 of Puerto Rico's delegates after posting a huge win in the U.S. territory. But he still lags far behind rivals Donald Trump and Ted Cruz.

Like many states, Puerto Rico awards all the GOP delegates to a candidate who gets more than 50 percent of the vote. Rubio was well above that threshold in the Sunday contest.

Rubio says his landslide win in Puerto Rico's primary is proof that he can expand his party in a general election.

The Florida senator is playing up his "electability" as he tries to catch GOP delegate leader Donald Trump and second-place Ted Cruz.

Rubio said in an interview Sunday that he "campaigned in Puerto Rico as a conservative" and still garnered more than 70 percent of the vote in an "open primary."

The senator says that "is evidence I can take conservatism to people who don't normally vote Republican" and win their support.

Because he claimed a majority in Puerto Rico, Rubio earns all 23 delegates from the island territory.

Based on updated results, Trump and John Kasich also picked up delegates in Vermont, which held its primary Tuesday.

In the overall race for delegates, Trump has 384 and Cruz has 300. Rubio has 151 delegates and Kasich has 37.

It takes 1,237 delegates to win the Republican nomination for president.