In a letter sent to the FCC, the group of 10 Senators warned that reclassification could give mobile service providers too much discretion when it comes to delivering text messages. Carriers could block texts or censor content if it is deemed to be unsavory or against terms of service. The move could also give telecom companies the ability to favor their own services, placing third-party messaging apps at a significant disadvantage.

The FCC is considering classifying texts as an information service in order to give carriers more tools to fight automated messages and spam texts. However, the Senators don't see the need. The Telecom Consumer Protection Act (TCPA) already requires senders to get permission from a receiver before sending an automated text. Additionally, there is concern that carriers might block legitimate bulk messages. Verizon did so in 2007 when it stopped women's rights advocacy group Naral Pro-Choice America from sending a mass text to its members because the content was considered controversial.

The letter, which was delivered to the FCC today, was signed by Sens. Markey, Ron Wyden, Kirsten Gillibrand, Tammy Baldwin, Richard Blumenthal, Tina Smith, Ben Cardin, Elizabeth Warren, Bernie Sanders and Dianne Feinstein.