With his surprising victory in the Iowa caucuses last Sunday, Republican presidential candidate Ted Cruz solidified his status near the top of the GOP field. But in the background, the controversy over his birthplace and his eligibility for the nation’s highest office simmered on.

At the forum “Is Ted Cruz Eligible to Be President?” held Friday at Wasserstein Hall in Harvard Law School (HLS), two constitutional scholars debated whether Cruz’s birth in Calgary, Alberta, to a Cuban father and an American mother disqualifies him to serve as president.

Laurence Tribe, the Carl M. Loeb University Professor and Professor of Constitutional Law, who teaches at HLS, argued that Cruz is ineligible to hold the presidency, using what he called Cruz’s own strict interpretation of the Constitution.