On Friday, a rally former President Donald Trump was hosting in Johnstown, Pennsylvania briefly erupted into chaos when one of his supporters lunged into the press area to attack journalists. Video of the incident shows the ex-president actively encouraging the man as he was being tackled by security. In the video — which was tweeted Saturday morning by former NBCUniversal senior executive Mike Sington — three angles of the incident are shown simultaneously. One angle shows Trump at the lectern as he’s speaking, another shows the overhead view of the Trump supporter jumping over the barricade …