Although the email chances were determined to be top secret they were not allocated that level of security when they were sent/received so did she actually do anything wrong? Yes it was stupid to do what she did but at the time I don't think she did anything illegal.
If Trump does get the Republican nomination then they can wave goodbye to the presidency... Reminds me a bit of a certain political situation over here which is all I will say on the matter as we've have enough threads about the UK situation
