Cruz fires back on citizenship, says McCain is trying to help Rubio
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Cruz brushed off McCain's suggestion that it was "worth looking into" the issue, saying the 2008 GOP nominee is simply trying to help Sen. Marco RubioMarco Antonio RubioGOP senators plan to tune out impeachment week Republicans warn election results are 'wake-up call' for Trump Paul's demand to out whistleblower rankles GOP colleagues MORE (R-Fla.) win the Republican nomination.
 
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"I think it is no surprise to anybody that John McCain is going to be supporting Marco Rubio in this election," Cruz told Bloomberg's Mark Halperin on "With All Due Respect."
 
"It's no surprise at all that he's trying to do what he can to help the candidate that he's favoring who he thinks shares policy positions with him," Cruz added. 
 
McCain, who faced similar eligibility questions during his 2008 bid, argued during a local radio program in Arizona on Wednesday that there is a difference between him and Cruz.
 
Cruz was born in Canada to an American mother. McCain was born on a U.S. military base in Panama. 
 
"So I think there is a question. I am not a Constitutional scholar on that, but I think it’s worth looking into. I don’t think it’s illegitimate to look into it," McCain said.
 
Cruz has argued that he is eligible for the presidency and a "natural born citizen" as stipulated by the Constitution after rival Donald TrumpDonald John TrumpThis week: House kicks off public phase of impeachment inquiry Impeachment week: Trump probe hits crucial point Judd Gregg: The big, big and bigger problem MORE questioned his eligibility on Tuesday.