Federal and city authorities say the gunman who opened fire outside a Texas bar, killing three people and wounding more than a dozen was not on their radar before the attack.

More than 70 GOP House members signed a letter asking Congress to stop legal immigration until “proper vetting protocols” are in place.

Ndiaga Diagne, a Senegalese immigrant-turned US citizen, was not on the radar of local police or the FBI before Sunday’s attack. Now, his personal life, criminal history and private affiliations are under extreme scrutiny as investigators dissect his motive.

Two victims were identified as investigation continues. FBI says suspect Ndiaga Diagne had not been on its radar, while APD said he legally purchased guns.

Monday marked 190 years of Texas’ independence as the state grows closer to its bicentennial anniversary. According to Texas 2036, a nonpartisan public policy organization,

The shooter was identified by Austin police as 53-year-old Ndiaga Diagne. Multiple U.S. officials told CBS News he was a naturalized American citizen born in Senegal. Investigators believe the gunman acted alone. Police say he had a handgun and a rifle during the attack. The guns were acquired legally in San Antonio in 2017, Davis said Monday.

Days out from the March primary, Republicans called for changes to immigration law. Democrats repeated their calls for stricter gun laws.