Washington ? Kansas Republican Pat Roberts promises to tie the U.S. Senate “up in knots” over any plan to move detainees from Guantanamo Bay to Kansas.

Roberts’ remarks Thursday to the Senate were the latest expression of opposition from Kansas officials to closing the prison at the U.S. naval base on Cuba. It still houses 241 suspected terrorists and enemy combatants.

Fort Leavenworth is one of several sites being considered to house detainees. President Barack Obama has ordered the Guantanamo Bay prison closed by January.

Roberts, a former Senate Intelligence Committee chairman, opposes closing it.

In prepared remarks, he told fellow senators if there’s a plan to bring detainees to Kansas, they should cancel summer plans because he’ll keep them in Washington to block the move.