The former U.S. Attorney General Eric Holder's National Redistricting Action Fund, the 501(c)4 of the National Democratic Redistricting Committee, is backing this second lawsuit.

Holder said on a conference call, the commission broke both the letter and the spirit of Ohio’s 2015 constitutional amendment reforming the redistricting process.

The NRAF's lawsuit comes a day after the ACLU of Ohio and other voting rights groups like the League of Women Voters of Ohio, filed their own lawsuit against the commission.

Marc Elias, the founder of Democracy Docket​ and of the Elias Law Group, said the two suits complement one another.

The main message being pushed is the five Republican members of the seven-member commission, which passed four-year Ohio House and Senate maps, gerrymandered the districts.

“These maps all but guarantee Republican supermajorities in both the Ohio State Senate and the state House, giving the GOP two-thirds of the seats in each body. Now, they have not earned that level of representation from Ohio voters,” said Holder.​

"If a commission is trying to do the right thing by its voters, it has no reason to hide draft maps from the public. It should welcome public input. The opposite was the case here. As a result of the blatant and repeated violations of the Ohio Constitution, I am confident that the courts will strike down the maps and direct the redistricting commission to begin drawing new maps," said Elias.

The four-year maps Republicans on the commission approved gave the GOP the advantage in 62 of 99 seats in the Ohio House and 23 of 33 seats in the Ohio Senate.

Meanwhile, Republicans are not surprised the lawsuits are coming in.

On Friday, Gov. Mike DeWine, R-Ohio, said Republicans knew whatever maps were drawn they would end up in court.

DeWine and the other statewide elected officials all said as much the night of the vote last week.

Secretary of State Frank LaRose and State Auditor Keith Faber said the maps were problematic but then cast their votes in favor of the maps anyway.

"I learned a long time ago not to judge what the courts are going to say. The courts are the ones who really determine whether it's constitutional or not. That night, I was very clear about what I thought should happen and very clear about where we should go. I thought that we would've been able to come up with a more bipartisan agreement. I think if we would've, that certainly would be more in line with what people expected of us but that was not happening. It was clear it was not going to happen. So now it's in the court and we'll abide by whatever the courts tell us to do," said DeWine.

Ohio Senate Majority Caucus Spokesperson John Fortney was blunt in his reaction to the lawsuit, saying, “First, Barack Obama’s lawyer sued and now Hillary Clinton’s lawyer sued. Two of the most partisan, far-left, polarizing figures in politics want to lecture Ohio voters about fairness. The so-called non-partisan voter groups finally showed how partisan and politically motivated they really are.”​

The Ohio Supreme Court justices could either the maps are constitutional and we would have four-year maps or they could say they are not constitutional and make the commission draw new maps.