The letter did not specifically mention either SOPA or the Protect IP Act.
House Oversight Committee Chairman Darrell Issa (R-Calif.) and Sen. Ron Wyden (D-Ore.) are pushing an alternative bill that focuses only on payment processors.
"Federal legislation can be used to stop these rogue sites and protect jobs," Brownback and Nixon wrote. "To disrupt the business model of rogue website purveyors and cut them off from the marketplace, law enforcement must be able to enlist the help of infrastructure platforms like Internet service providers and financial service payment processors. Narrowly tailored authority to disrupt these sites will help Internet users find legitimate sources for goods and content, and will ensure that counterfeiters and pirates can no longer profit from this illegal activity."