The Hill 
August 19, 2013
Sen. Ted Cruz (R-Tex.) released his birth certificate  to the Dallas Morning News on Sunday, a move that will undercut critics who say he’s ineligible to run for president.
Cruz was born in Canada to an American mother. The Constitution says only a “natural born” American citizen can become president, which includes those born overseas to American parents.
However, The Dallas Morning News reports that under Canadian law, Cruz’s birthplace of Calgary also made him an instant citizen of Canada. The Constitution doesn’t address whether someone with dual citizenship can run for the highest office.