Border Patrol commander Gregory Bovino has gone on a frantic social media posting spree as he doubles down on defending the killing of a protester by federal agents in Minneapolis. The leader of Donald Trump’s anti-immigrant surge in Minnesota was posting late into the night as he and other senior administration officials face intense backlash for their response to the shooting of 37-year-old Alex Pretti. Multiple videos from the scene show that Pretti—who was legally permitted to carry a firearm—never drew his handgun at officers and appeared to have been disarmed before he was shot. The Second Amendment protects Americans’...