President Trump is calling for an 18-month extension of Section 702 of the Foreign Intelligence Surveillance Act, a controversial program that allows U.S. spy agencies to collect foreigners' communications without warrants but also incidentally sweeps up Americans' data. While Trump previously opposed the program and once posted "KILL FISA" on social media, he now says it's proven vital to national security, particularly in recent operations involving Venezuela and Iran. Critics in Congress are pushing for reforms including warrant requirements before accessing Americans' communications and restrictions on government use of data brokers, though significant changes appear less likely following Trump's endorsement.