AUSTIN, Texas -- Canadian-born U.S. Sen. Ted Cruz has yet to renounce his Canadian citizenship as promised, but looks forward to the process being completed soon.

Catherine Frazier, a spokeswoman for the conservative tea party favourite from Texas, said Saturday that lawyers are preparing the paperwork.

She said Cruz, who was born in Calgary, Alberta, "has been fully focused on fighting for Texans' values and interests" and that he "looks forward to the process being completed soon."

Cruz took office last year, but is already being mentioned as a possible Republican presidential contender in 2016.

Amid questions about his eligibility, Cruz released his birth certificate in August. He also pledged to renounce his Canadian citizenship.

Frazier's response comes after a Canadian immigration attorney said the process was simple and wondered about the delay.