"Well look, you have no choice. I mean we have to solve all sorts of problems, and fairness is you have to look into that. Now, maybe she can prove her innocence, but it just seems to me I think the public knows everything that they're going to know," Trump told media in an interview.

Clinton, however, fired back quickly claiming nothing has been proved so far against her.

"I can only tell you what the facts are, and the facts are that every single time somebody has hurled these charges against me, which they have done, it's proved to be nothing. And, this is no different than that,” Clinton said at a CNN-organised town hall in Columbia, South Carolina, which goes for the Democratic presidential primary over the weekend.

The former Secretary of State was responding to questions on a ruling by a federal judge on a motion that could pave the way for the possibility that you could be subpoenaed in order to obtain any information.

Clinton is leading South Carolina by a huge margin and is expected to win the Democratic party primary over the weekend.

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