Days before former President Trump's impeachment trial begins, newly filed federal charges against anti-government activists offer fresh, compelling evidence that the accused perpetrators of the Capitol riots pre-planned their attack days and weeks in advance and in plain sight of an FBI that vowed to be vigilant to extremist threats. A dozen FBI affidavits supporting charges against the more than 200 defendants show rioters engaged in advance planning on social media sites. The planning included training, casing sites, identifying commanders on scene, and requests for donations of cash, as well as combat and communication gear. More than a half dozen...