A former advisor to Vice President Mike Pence says she had to convince then-President Donald Trump not to send federal troops to shoot at her friends and their families. Olivia Troye, homeland security advisor to former Vice President Mike Pence, appeared on CNN Tuesday morning to discuss her warnings of the authoritarian threat she believes the Republican presidential nominee now poses. “I walked those grounds outside the White House the day that Donald Trump suggested we shoot protesters and Americans,” Troye said. “I had friends there in that square with their families. They were peacefully…