In October 2008, Leo Donofrio, an attorney from New Jersey,[136] filed suit to challenge the eligibility of Obama, Republican presidential candidate John McCain (see details here) and the Socialist Workers Party candidate Roger Calero.[2] Donofrio asserted that all three candidates were ineligible: Obama due to having dual US and British nationality at birth (the latter via Obama's father), McCain due to being born in the Panama Canal Zone, and Calero due to allegedly still having Nicaraguan citizenship

In October 2008, Leo Donofrio, an attorney from New Jersey,[136] filed suit to challenge the eligibility of Obama, Republican presidential candidate John McCain (see details here) and the Socialist Workers Party candidate Roger Calero.[2] Donofrio asserted that all three candidates were ineligible: Obama due to having dual US and British nationality at birth (the latter via Obama's father), McCain due to being born in the Panama Canal Zone, and Calero due to allegedly still having Nicaraguan citizenship