The US Supreme Court issued a major ruling Tuesday over-turning a part of the 1965 Voting Rights Act. 

The ruling could have a big impact on Florida, which has five counties that are subject to the very part of the law that was struck down.

The Supreme Court ruled that Section 4 of the Voting Rights Act is “unconstitutional.” This part of the civil rights-era law sets a formula for which states or individual counties have to get federal approval of their voting laws.

In Florida: Collier, Hardee, Hendry, Hillsborough and Monroe Counties all fell under those guidelines.

However, in a 5 to 4 vote, Supreme Court Justices scratched the formula that determines who has to get cleared by the federal government. The majority opinion wrote it’s now up to Congress to come up with a new formula.

Executive Director of the ACLU of Florida Howard Simon said considering how grid-locked Congress has been, this means more work.

“What I think today’s decision means is that the burden to defend voting rights is going to fall more heavily on civil rights groups like the ACLU,” he said.

Simon said Section 2 of the Voting Rights Act allows groups like his to fight laws they say discriminate against certain voters.

In 2011, the Republican-led Florida Legislature passed a controversial voting law, which lawmakers had to overhaul this year due to long lines in Florida during this past presidential election. Simon said Florida is the perfect example of why federal oversight is necessary.

“One of the things that make me so disappointed about today’s decision is that federal oversight, in some areas, are really needed,” Simon said. “And certainly, my god, that is true of Florida. This legislature and this governor are walking advertisements of why we need a voting rights act and why we need federal oversight.”

Section 4 required any state or county where fewer than half its eligible population voted in 1964, or had a literacy test in place, be subject to federal oversight in the future.