Speaker of the House John Boehner accused Hillary Clinton of lying about her emails while serving as secretary of state.

"She's not telling the truth. She had an obligation to turn these emails over," the Ohio Republican said on CBS Sunday, referring to Clinton's statements last week that she had no legal obligation to turn over her personal emails sent during her time with the State Department, but that she did because the government already had them.

Boehner said he may issue another subpoena for Clinton's email server, but also may leave that for the State Department's inspector general. The House Select Committee on Benghazi released a picture of a subpoena it said it issued to Clinton in March — one she Clinton says she never got.

"I'm not going to rule in or out any of those options. I would hope we wouldn't have to do that. She wants this investigation over, she wants ... this all to be cleaned up. But the fact is it's not going to be cleaned up until we get the emails," Boehner said.

"I would hope they would turn them over or the State Department would go after the server. Congress doesn't want the server," he added. "The State Department IG is the appropriate group of people to go through these emails to make those determinations."