New York Attorney General Barbara Underwood wants her lawsuit against the Trump administration over its decision to ask about citizenship on the 2020 U.S. Census to go to trial—but not only because her team thinks they have a better legal argument.

Lawyers with the Attorney General’s Office said in a new filing late Thursday that deciding the lawsuit by trial, rather than summary judgment, would help uncover the Trump administration’s motivations to add the question, which was announced by U.S. Commerce Secretary Wilbur Ross in March.