Updated

U.S. Sen. Ted Cruz vowed months ago to renounce his Canadian citizenship by the end of 2013, but the Calgary-born Republican is still a dual citizen.

Cruz, 43, recently said in an interview with the Dallas Morning News that lawyers are preparing the paperwork to renounce citizenship, just as he said in August.

Richard Kurland, a Vancouver-based immigration attorney, wonders what's taking so long. Kurland said Friday that unless there's a security or mental health issue that hasn't been disclosed, renouncing citizenship is a simple, quick process.

The thorny issue of the tea party darling's birthplace has been a headache for the senator, since some in the neo-conservative movement had accused President Barack Obama of being born in Kenya and thus not eligible to be U.S. president.