Story highlights Puerto Rico's 60 delegates were on the line in Sunday's Democratic presidential primary

Clinton is closing in on a historic nomination as the first female presidential nominee

Washington (CNN) Hillary Clinton has won Puerto Rico's Democratic primary, putting her on the cusp of clinching the party's presidential nomination.

Clinton is not expected to win all 60 delegates that were at stake Sunday, which would have put her over the top in the nomination battle against rival Bernie Sanders. She remains shy of the 2,383 she needs to win the Democratic nomination.

Clinton is closing in on a historic nomination as the first female presidential nominee with one more round of states -- California, New Jersey, New Mexico, South Dakota and Montana -- set to vote Tuesday. Her nomination would become official during the Democratic National Convention in Philadelphia.

She'll become the first-ever female nominee of a major political party.

Her total delegate haul includes superdelegates, party officials who are unbound and can switch their support at any time. Those superdelegates have overwhelmingly supported Clinton over Sanders, but could technically change their position.

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