Republican lawmakers grilled Attorney General Loretta Lynch on Tuesday over why she chose not to prosecute Democratic presidential candidate Hillary Clinton for sending classified data through her private e-mail server when she was secretary of state.

But the Obama appointee refused to answer, saying it would be “inappropriate” to respond to lawmakers’ repeated questions.

“While I understand that this investigation has generated significant public interest, as attorney general, it would be inappropriate for me to comment further on the underlying facts of the investigation or the legal basis for the team’s recommendation,” Lynch told the House Judiciary Committee’s Subcommittee on the Constitution and Civil Justice.