Why was there no communication for about 20 minutes between the time some law enforcement officers spotted the Trump shooter and when he started firing? That’s one of many questions that Rep. Mark Green, R-Tenn., will have for the director of the Secret Service. Green, chair of the House Oversight Committee, has issued a subpoena for Kimberly Cheatle to appear at a Monday hearing on the shooting. He talked about the situation on NewsNation’s “On Balance.” #trumpassassinationattempt #markgreen #secretservice "On Balance with Leland Vittert" takes a critical look at some of the day's hottest subjects. Weekdays at 7p/6C. #OnBalance NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij