The presumptive U.S. Democratic presidential nominee Hillary Clinton was interviewed for three and a half hours by the Federal Bureau of Investigation (FBI) Saturday as part of the investigations regarding her use of a private email server during her term as the secretary of state.

A representative from Clinton’s campaign reportedly said that it was a voluntary interview. Clinton had come under fire when it was revealed that she used a personal email server kept in her Chappaqua, New York, home while she was the secretary of state from 2009 to 2013. One of the key questions is whether Clinton and her aides mishandled classified information on the server.

“I've been eager to do it, and I was pleased to have the opportunity to assist the department in bringing its review to a conclusion,” Clinton said of the FBI session to NBC’s “Meet the Press” for an interview to air Sunday. 

The FBI refused to comment, reports said.

Clinton has consistently denied handling classified information in her private emails. She reportedly set up the email address for reasons of convenience. She said it was easier to do everything from her Blackberry than to have several phones or tablets. The justice department is seeking to establish if this constitutes a criminal offense.

A State Department inquiry accused her and her predecessors of poorly managing email security.

U.S. Attorney General Loretta Lynch reportedly said Friday she would accept the findings of the FBI and prosecutors when it comes to deciding whether to charge Clinton. In a turn of events, it was revealed that Lynch had a meeting with former U.S. President and Clinton’s husband, Bill Clinton. Lynch said it was a “social” meeting and had nothing to do with the ongoing investigation, which the presumptive nominee echoed in her NBC interview.

“But obviously no one wants to see any untoward conclusions drawn, and they've said, you know, they would not do it again,” she reportedly said.

The presumptive Republican U.S. presidential nominee, Donald Trump, took to Twitter to express his views on the issue. “It is impossible for the FBI not to recommend criminal charges against Hillary Clinton. What she did was wrong! What Bill did was stupid!” he tweeted.