Story highlights Donald Trump says he isn't sure whether Marco Rubio is eligible for the presidency

Trump's latest move is similar to his efforts to question the eligibility of President Barack Obama and Ted Cruz

Washington (CNN) Donald Trump says he's not sure whether Marco Rubio is eligible for the presidency.

And Rubio says it's just the latest in a line of Trump's "outrageous" comments designed to suck up media attention.

Rubio is a U.S. citizen who was born in Miami. He is, in fact, eligible for the presidency -- even though his parents migrated from Cuba.

But Trump stirred controversy on Saturday by retweeting a message suggesting that neither Rubio nor Texas Sen. Ted Cruz, who was born in Canada to a U.S. citizen mother, meet the constitutional requirements for the Oval Office.

"@ResisTyr: Mr.Trump...BOTH Cruz AND Rubio are ineligible to be POTUS! It's a SLAM DUNK CASE!! Check it! https://t.co/NjqWP0pP6X" — Donald J. Trump (@realDonaldTrump) February 20, 2016

In an interview on ABC's "This Week" with George Stephanopoulos, Trump said he didn't know about Rubio's case.

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