Lawmakers scramble after Trump derails bid to revive key counterterrorism tool days after FBI thwarts UFC plot

The Senate was nearing a resolution to a key hurdle to revive the nation’s most valuable counterterrorism tool until President Donald Trump blew it up.

The last-minute hitch to the Senate’s march toward reauthorizing Section 702 of the Foreign Intelligence Surveillance Act (FISA) comes just days after a domestic terror plot was foiled in Washington, D.C.

It’s a program that its champions and critics say is critical to thwarting terror plots abroad and one heavily used by the FBI, which...