Trump was scrutinized last week after a watchdog cited uses of her private account while serving as a presidential aide.
The group said she'd corresponded with Trump Cabinet officials, including Education Secretary Betsy DeVos, Small Business Administration chief Linda McMahon and Commerce Secretary Wilbur Ross using her private email account.
"All of my emails are stored and preserved," Ivanka Trump told ABC News Tuesday. "There were no deletions. There is no attempt to hide. There's no equivalency to what my father's spoken about."
The president, who still criticizes Clinton for using a private account while she was secretary of state, has defended his daughter. He told reporters last week all of her government-related emails sent on the account have been placed "in presidential records."
"There is no restriction of using personal email," Ivanka Trump added. "In fact, we're instructed that if we receive an email to our personal account that could relate to government work, you simply just forward it to your government account so it can be archived."
"The president's family is not above the law, and there are serious questions that Congress should immediately investigate," Austin Evers, executive director of American Oversight, said in his call for an inquiry.
Clinton became the focus of a Justice Department investigation -- which impacted the 2016 presidential election -- that ultimately concluded no charges against her were warranted.