This article was first published by The Texas Tribune, a nonprofit, nonpartisan media organization that informs Texans — and engages with them — about public policy, politics, government and statewide issues. Sign up for The Brief, The Texas Tribune’s daily newsletter that keeps readers up to speed on the most essential Texas news. WASHINGTON — New, harrowing video of the Jan. 6 insurrection features U.S. Rep. Troy Nehls in the House chamber, flanked by a Capitol security guard aiming his pistol at rioters on the other side of a door trying to break through. The video was released Friday by th…