Former New York City mayor Rudy Giuliani said Sunday he would have prosecuted Hillary Clinton over her email scandal and guaranteed he would have won the case, casting the Democratic presidential candidate as an unrepentant liar.

Mr. Giuliani, who has emerged this election cycle as one of Mrs. Clinton’s loudest critics, said the Justice Department made a mistake in not prosecuting the former secretary of state, who continues to wrongly claim she did not send or receive any classified information on her private email server.

An FBI investigation found that classified information was, in fact, on her private account, though federal officials decided against pressing charges against her.

“Many reasonable prosecutors have come to the conclusion that they would have brought such a case. I would have brought such a case. I would have won such a case,” Mr. Giuliani, a former federal prosecutor, told ABC’s “This Week.” “I’ve prosecuted cases like that in my years at the Justice Department. Hillary Clinton skated because she’s running for president. She clearly violated the law.”

On Friday, Mrs. Clinton again contradicted FBI Director James Comey when she said no messages marked as “classified” were sent or received from private email account. She also said she “short-circuited” last week when she incorrectly claimed Mr. Comey verified that everything she had told the American people about the email scandal was accurate.

Her “short-circuit” phrase has given Republicans fresh ammunition against her.

“She now has a fundamental way of saying to people, ‘It wasn’t that I lied to you. I just didn’t quite remember what it is I was going to say,’” former House speaker Newt Gingrich told “Fox News Sunday.”

Mr. Giuliani called Mrs. Clinton’s defense a “euphemism for lying.”

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