Senator John McCain says "it's worth looking into" whether Texas Senator Ted Cruz is eligible to serve as President.

The Arizona Republican addressed the matter yesterday on 550 KFYI's "The Chris Merrill Show" and said he's really unsure about Cruz's status. Cruz was born in Canada to an American mother. He had dual U.S. and Canadian citizenship until renouncing his Canadian citizenship in 2014.

McCain says he was questioned about his eligibility when he was the Republican nominee in his race against Barack Obama in 2008. McCain was born on a U.S. military base in Panama, where his father was serving in the U.S. Navy.

GOP frontrunner Donald Trump raised the issue of Cruz's eligibility in an interview with the Washington Post earlier this week. McCain says he was born on a U.S. military base, which is different from Cruz's situation. McCain says Cruz might do well to get out ahead of this potential controversy.

Listen to the interview on 550 KFYI's "The Chris Merrill Show" below: