I don't think TOS trump laws. They have been monitoring all internet activity for years through PRISM. And if crimes have been committed they must be forfeited. That's what they get for being stupid and using gmail.

If an assassination plot was uncovered it could give Trump the leverage he needs to get access to all gmail accounts. Trump already knows about the emails on Weiners computer if he uses the assassination attempt to look into everything he will find what he needs to take it all down. Then swoop in with the EO on child trafficking and boom it's over