 Horn also announced she supports Republican National Committee Reince Priebus's proposed boycott of CNN and NBC, threatening to deny them Republican participation in the 2016 presidential debates, if the two networks go ahead with their proposed projects featuring Hillary Clinton.Since Donald Trump took office as president, Horn has been one of his most prominent Republican critics.Along with several other prominent Republican strategists, she cofounded the Lincoln Project, which aims to defeat Trump and his supporters in Congress.