In the last year, the SEC sued Ripple, for allegedly illegal digital security-offering. The rumor just started, Tron may be the next target among others, due to their ICOs. Tron also issued tokens in 2017. Justin Sun, founder and leader of the project said, there is no official legal action against Tron or any member of the Tron ecosystem.
Ripple is in danger because SEC considers the XRP tokens as securities. Of course, SEC is an executive organization, they don’t do definition themselves. SEC works based on the laws, that are voted by the represents of the country.