 Echoing Mr. Trump's call for national unity, President Biden, making a brief address from the Oval Office last evening. We may disagree. We are not enemies. We're neighbors. We're friends, coworkers, citizens, and most importantly, we're fellow Americans. In the aftermath of the assassination attempt, there are many questions, and many of them focus on how the gunman, who was armed with a long rifle, was able to gain access to a rooftop so close to the scene of the Trump rally in Butler, Pennsylvania.