A group of 11 conservative organizations are calling on Speaker John Boehner (R-Ohio) to keep the Defense Appropriations bill open to all amendments when it hits the floor.

The fiscal conservative groups wrote a letter to Boehner Monday urging him to allow an open bill on the floor, as House Republican leaders are weighing limiting amendments to the Pentagon spending bill.

The groups said that restricting amendments would break with Boehner’s pledge to follow regular order and allow open debate.

“You have indicated several times your preference for free and open debate on the floor,” wrote the groups, led by Taxpayers for Common Sense. “On behalf of our members and supporters we strongly urge you to maintain the traditional open rule and open amendment process for this important bill.”