The U.S. Attorney's Office said evidence showed that Joshua Jahn had been planning the attack for some time and acted alone.

"This violence is the result of the Radical Left Democrats constantly demonizing Law Enforcement, calling for ICE to be demolished, and comparing ICE Officers to 'Nazis,'" Trump wrote in a social media post on Wednesday, in which he said he had been briefed on the shooting.

An hour after posting about the Texas attack, the vice president shared the meme appearing to make fun of himself

Dario Sanchez says authorities are punishing peaceful activists after a July 4 protest turned violent outside a Johnson County detention center.