"I continue to believe that she has not jeopardised America's national security. Now what I've also said is that -- and she has acknowledged -- that there's a carelessness, in terms of managing e-mails, that she has owned, and she recognises," Obama told Fox News in an interview.
Obama was responding to a question on an ongoing FBI probe into the emails and private email server which Clinton hosted at her home when she served as the Secretary of State in the first term of Obama Administration.
Clinton, the Democratic presidential frontrunner, is eyeing to become the first woman president of the US after Obama leaves office in January.
Defending Clinton, the US president said: "I also think it is important to keep this in perspective. This is somebody who has served her country for four years as Secretary of State, and did an outstanding job. And no one has suggested that in some ways, as a consequence of how she's handled e-mails, that detracted from her excellent ability to carry out her duties."
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"I do not talk to the Attorney General about pending investigations. I do not talk to FBI directors about pending investigations. We have a strict line, and always have maintained it," he said.
"I guarantee that there is no political influence in any investigation conducted by the Justice Department, or the FBI, not just in this case, but in any case. Full stop. Period," he said.
"Nobody gets treated differently when it comes to the Justice Department, because nobody is above the law," he said.
Obama said he knows how hard the job of president can be.
"That's why I know Hillary will be so good at it," said the US President.
"I don't think there's ever been someone so qualified to hold this office. She's got the courage, the compassion, and the heart to get the job done. (I say that as someone who had to debate her more than 20 times. )," Obama said in the email titled "I'm with Hillary".
"Even after our own hard-fought campaign in 2008, she agreed to serve our country as secretary of state," he said, adding that he can't wait to get out there and campaign for Clinton.