Republican lawmakers are calling into question plans to try terror suspects in the U.S.

Members of the GOP gathered at the Supreme Court to draw attention to President Obama's effort to close the prison at Guantanamo Bay, as well as the decision to hold alleged 9-11 mastermind Khalid Sheikh Mohammed's trial in New York City.

Rep. Pete Hoekstra, R-Mich., said it was "irrational" to send some detainees overseas and transfer some to the U.S.

"We need an explanation and we need more transparency, we need some transparency from this administration as to how these strategies are intended to keep America safe where many of us in this field recognize they will put this country at greater danger not abroad, but right here at home," Hoekstra said.

A start date for those terror trials has not been announced.