WASHINGTON (AP) — The White House and congressional backers of the National Security Agency's surveillance program warn that ending the massive collection of phone records from millions of Americans would put the nation at risk from another terrorist attack. The vote on Wednesday would be the first time Congress has weighed in since former NSA systems analyst Edward Snowden leaked documents that revealed that the NSA had collected phone records, while a second NSA program forced major Internet companies to turn over contents of communications to the government. While many members have legitimate questions about the NSA metadata program, including whether there are sufficient protections for Americans' civil liberties," the chairman wrote, "eliminating this program altogether without careful deliberation would not reflect our duty, under Article I of the Constitution, to provide for the common defense. The debate over privacy and national security has prompted calls and emails to lawmakers, said Rep.