Story highlights Clinton is pushing back against a report saying she failed to follow the rules regarding her use of a private email server

Clinton reaffirmed that she had made an error

Washington (CNN) Hillary Clinton defended her email practices as secretary of state on Thursday, saying the rules that governed its use were hardly a "model of clarity."

"I thought it was allowed. I knew past secretaries of state used personal email," she told CNN's Wolf Blitzer on "The Situation Room, saying the rules were only recently improved.

"They were not a model of clarity and it seems like there is still more work to do on that," she said.

Clinton reaffirmed that she had made an error in using a private email server, saying, "It was still a mistake. If I could go back, I'd do it differently."

She also attacked Donald Trump, who on Thursday clinched the necessary delegates for the Republican presidential nomination. She pushed back on his accusation that she wanted to "abolish" the Second Amendment as "absolutely ridiculous" and called it another example of his "fantasy campaign."

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