Clinton made a mistake over private email server, but didn't harm national security, Obama says
The US president said much of the criticism levelled at the Democratic presidential candidate was to do with politics

Hillary Rodham Clinton's use of a private email server to conduct government business when she served as secretary of state was a mistake but didn't endanger national security, President Barack Obama said during an interview airing on Sunday on CBS's 60 Minutes.
Obama said public officials had to be more sensitive about how they handled information and personal data. Yet he also said the criticism of Clinton, who is leading the Democratic race for the presidential nomination, had been “ginned up” because of politics.
“I think she'd be the first to acknowledge that maybe she could have handled the original decision better and the disclosures more quickly,” Obama said.

He also said he was not initially aware of her use of the private email server.
There are still questions being raised about the security of that system.
Senate investigators recently discovered that Clinton's private server was subjected to unspecified hacking attempts in 2013 from China, South Korea and Germany. The FBI is still examining her system, and that review could reveal evidence, if any, of unauthorised intrusions into her server or any attempts to siphon off her data.