Ted Cruz

Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks at Green County Community Center, Monday, Feb. 1, 2016, in Jefferson, Iowa. (AP Photo/Chris Carlson)

Five Cullman County residents - all supporters of Donald Trump - filed a federal lawsuit this week against 2016 Republican presidential candidate Ted Cruz, alleging that the Texas senator is ineligible for the presidency because he's not a natural born citizen.

The Drake Law Firm in Cullman sent the lawsuit to AL.com on Friday. The suit urges the court to declare Cruz "ineligible and disqualified to run/seek the office of president of the United States of America" because he was born in Canada in 1970.

Cruz has maintained that he is eligible to run because his mother was a U.S. citizen at the time of his birth. His campaign did not immediately respond to the lawsuit, filed in the U.S. District Court in the first of its kind filed in Alabama.

While the plaintiffs concede that Cruz is a citizen, they contend that Cruz is not a natural-born citizen. They cited a portion of the Constitution that says "no person except a natural-born citizen, or a citizen of the United States, at the time of the adoption of this constitution, shall be eligible to the office of president."

"Plaintiffs allege that at the time of Mr. Cruz's birth, the United States could not confer citizenship upon him under any law or legal theory that exists," the lawsuit states. "'Natural born' means native born within the United States or its dominions/territories. Canada is not a territory of the United States. Whether the Defendant's mother was/is a United State's [sic] citizen is irrelevant. If however, she had been an Ambassador to a foreign country; or, stationed in another country while serving in the military, such would not bar Mr. Cruz's candidacy."