By Raphael Satter WASHINGTON (Reuters) – Congress is preparing to extend the domestic surveillance authority that allows law enforcement to spy on Americans without a warrant by another four months, giving lawmakers more time to either reform or keep the disputed program. The extension of the surveillance provision – known as Section 702 of the Foreign Intelligence Surveillance Act (FISA) – was tucked into the 2,353rd page of the more than 3,000-page National Defense Authorization Act, a must-past piece of legislation which lawmakers hope to send to President Joe Biden’s desk before the end of…