Tensions between House Financial Services Committee Chairwoman Maxine Waters, D-Calif., and Treasury Secretary Steven Mnuchin boiled over on Tuesday, as the two sparred over Mnuchin’s effort to end his committee testimony to meet with a foreign dignitary.

Mnuchin asked to leave the committee after three hours and 15 minutes of testimony. Waters told Mnuchin that he was free to leave, but declined to end the hearing, where several members waited to question Mnuchin.