Senator Marco Rubio
Senator Marco RubioReuters

Florida Senator Marco Rubio confirmed Monday that he will announce on April 13 whether he will be a candidate for the GOP presidential nomination in 2016.

“I will announce on April 13th what I’m going to do next in terms of running for president or the U.S. Senate,” Rubio told Fox News.

Rubio has said he would not run for both offices in 2016, while his team has been moving ahead as though it were putting together a White House bid, including donors who helped previous presidential nominees collect tens of millions of dollars.

He faces steep challenges to win the nomination, including from his one-time mentor, former Florida Governor Jeb Bush. He could face as many as 20 other rivals for the GOP nomination, noted Fox News.

A site for the announcement has not been finalized but Rubio's senior aides plan to visit the Miami area on Tuesday to scout options.

A first-generation immigrant whose parents fled Cuba, Rubio could make history as the nation's first Hispanic president.

Rubio has expressed support for Israel and in 2013 visited the Jewish state, where he met Prime Minister Binyamin Netanyahu and then-President Shimon Peres.

Earlier this month, he accused President Barack Obama of not supporting Israel enough, saying Obama’s foreign policy “treats the ayatollah of Iran with more respect than the prime minister of Israel.”

Last week, Rubio delivered a powerful speech against Obama's increasing hostility towards Israel after Prime Minister Binyamin Netanyahu's elections victory.