Hillary Clinton is taking aim at the NRA after the deadliest mass shooting in U.S. history last night. In a series of tweets, Clinton called on lawmakers to "put politics aside and stand up to the NRA." She tweeted "The crowd fled at the sound of gunshots. Imagine the deaths if the shooter had a silencer, which the NRA wants to make easier to get." Clinton said the country is grieving with the victims, but "grief isn't enough ... we must work together to stop this from happening again."