A group of senators, including Democratic presidential candidate, Bernie Sanders, is trying to keep companies from calling borrowers’ cellphones to collect on debt held or backed by the federal government, including student loans and mortgages.

Sen. Ed Markey (D-Mass.) introduced a bill earlier this week that would reverse a controversial provision tucked into the budget bill passed last week, allowing companies that collect debt for the federal government to use robocalling technology to call borrowers’ cellphones without their permission. Sanders and others, including Sen. Elizabeth Warren (D-Mass.), co-sponsored the bill.