Senators are working to secure enough votes to reinstate net neutrality rules as they prepare to formally try and overrule the Federal Communications Commission (FCC).

Last year, the FCC voted to dismantle Obama-era rules that prohibited internet service providers from treating traffic unevenly. While supporters said the change would free the industry from cumbersome rules that stifled innovation, critics warned it would erode an open internet by allowing a multi-tiered web.

Channelling the broad backlash, elected officials swiftly vowed to counteract the FCC’s decision. In the Senate, Massachusetts Democrat Ed Markey spearheaded an effort to reverse the FCC’s decision by leveraging the Congressional Review Act, which allows legislators to rebuff regulatory changes. The effort caught on quickly, drawing enough cosponsors to force a floor vote. Now, with a mid-June deadline approaching, Senate Democrats are moving to act on their promises.