The National Rifle Association (NRA) claims in a new video that President Trump and his supporters are being subjected to the most "ruthless" attack against a U.S. president and his supporters in the history of the country.In a video posted Friday to the group's Twitter account, spokeswoman Dana Loesch accuses Democrats and other critics of the Trump administration of trying to delegitimize Trump's presidency.“We are witnesses to the most ruthless attack on a president and the people who voted for him, and the free system that allowed it to happen, in American history," Loesch says at the beginning of the video.Scenes...