Congressional Democrats today introduced legislation that would prevent the repeal of neutrality rules, but they still need more support from Republicans in order to pass the measure.

Democrats have been promising to introduce a Congressional Review Act (CRA) resolution ever since the Federal Communications Commission voted to repeal its net neutrality rules in December. But lawmakers had to wait for the FCC's repeal order to be published in the Federal Register, which only happened last week.

The CRA resolution would nullify the FCC's repeal order, allowing net neutrality rules that were passed in 2015 to remain in place. The resolution has public support from 50 out of 100 senators (all Democrats, all Independents, and one Republican), putting it one vote shy of passage in the Senate.

Democrats will force a vote on the Senate version of the resolution sometime this spring, Sen. Ed Markey (D-Mass.) said today.

"The grassroots movement to reinstate net neutrality is growing by the day, and we will get that one more vote needed to pass my CRA resolution," Markey said. "I urge my Republican colleagues to join the overwhelming majority of Americans who support a free and open Internet. The Internet is for all—the students, teachers, innovators, hard-working families, small businesses, and activists, not just Verizon, Charter, AT&T, and Comcast and corporate interests."

Sometime this spring, @SenateDems will force a vote on the CRA to save #NetNeutrality. With #OneMoreVote, we will pass it and the fight will move to the House where @USRepMikeDoyle's companion resolution has 150 co-sponsors. We are so close, but now we must fight even harder. — Ed Markey (@SenMarkey) February 27, 2018

Democrats face a tougher task in the House, where Republicans have a 238-193 majority. President Trump could veto the resolution if it passes both chambers.

All senators and representatives who have publicly supported the resolution are listed at this website maintained by Fight for the Future, an advocacy group. The site also lists those lawmakers that have not publicly supported the resolution and urges net neutrality supporters to contact them.

In the Senate, Democrats need signatures from 30 senators to submit a discharge petition that would require a vote. "Once the discharge petition is filed, Senator Markey and Senate Democrats will demand a vote on the resolution," Markey's announcement said.

Democrats were able to get up to 50 votes in the Senate when Sen. Susan Collins (R-Maine) became the only Republican senator to support the bill in mid-January. Democratic lawmakers and advocacy groups have been trying to convince one of the remaining Republican senators to switch sides on the issue, but they haven't been successful yet.