WASHINGTON (AP) — Republican senators eyeing the presidency split over the renewal of the USA Patriot Act surveillance law, with civil libertarians at odds with traditional defense hawks who back tough spying powers in the fight against terrorism.

The political divide will be on stark display this month as Congress debates reauthorization of the post-Sept. 11 law ahead of a June 1 deadline. The broader question of privacy rights has gained attention since a former National Security Agency systems administrator, Edward Snowden, disclosed in 2013 that the NSA had been collecting and storing data on nearly every American’s phone calls for years.