U.S. Senate candidate Abby Finkenauer will appear on the June Democratic primary ballot, the Iowa Supreme Court ruled Friday, reversing a district court decision that found she failed to qualify.

The ruling ends a tense week for Finkenauer, a former U.S. representative who is vying for the Democratic nomination to take on Republican U.S. Sen. Chuck Grassley.

On Sunday, a district court judge ruled Finkenauer failed to qualify for the June 7 primary ballot because three signatures submitted as part of her nominating petitions lacked a correct date.

The Supreme Court overturned that lower court decision Friday, allowing Finkenauer to appear on the ballot.

In a call with reporters Friday afternoon, Finkenauer thanked her supporters and said the Republican-backed challenge shows the GOP is scared to run against her in November.

“Today is a good day for Iowa and democracy,” Finkenauer said. “The reality is with this unanimous decision by the Iowa Supreme Court affirming that we met the requirements to be on the ballot for United States Senate that this is something, again, that is important not just for Democrats but for Republicans and independents and anybody who cares about the direction of our state and our country.”

More:Iowa Supreme Court weighs whether U.S. Senate candidate Abby Finkenauer can appear on primary ballot

Finkenauer was saved by a Republican-supported election law enacted last year that provided specific instructions about when objections to candidates’ nominating petitions will be upheld.

Mistakes that would disqualify signatures include if the signature is missing, the signer leaves off their residential address, if any information is crossed out or if the petitions are missing information about the candidate. But the disqualifying mistakes do not include the part of the law that requires the signature to include a date.