It's a common claim in social media that Hillary Clinton should be convicted of criminal charges and sentenced to a prison term because of how she accessed classified information. A notable claim to this effect has been made by Donald Trump:
Look, she has done things that are absolutely wrong and absolutely illegal no matter how you look at it [...] What the Democrats are doing is preserving her to run for office. Anybody else who did what she did would now be sitting in the clinker.
He has also been quoted saying:
People are in jail right now for doing five percent of what she did and the Democrats are not going to prosecute her, and it’s frankly a disgrace.
There are many internet articles refuting or supporting the potential for criminal charges, but they all require speculation based on what she could be charged with, and how likely that charge sticking is.
So how true is this claim? Are there any former (or current) officials who have been convicted of something similar? If so, are they in prison?