Ohio election officials on Wednesday found hundreds of previously uncounted votes in its hotly contested special election for the state’s 12th Congressional District.

Officials found the votes in a Columbus suburb, according to the Cincinnati Enquirer, netting Democratic candidate Danny O’Connor 190 more votes and narrowing his race against Republican Troy Balderson to 1,564 votes.

“The votes from a portion of one voting location had not been processed into the tabulation system,” the Franklin County Board of Elections said in a news release obtained by the paper.

Balderson, who was backed by President Trump and Ohio Gov. John Kasich (R) during his campaign, claimed a narrow victory on Tuesday night for the district which Trump won and which has been held by a Republican since 1983.

O’Connor has said he has no plans to concede the race until all votes have been counted. According to the Enquirer, 3,435 provisional ballots and 5,048 absentee ballots still have yet to be counted, but have a deadline of Aug. 24.

State election officials will issue an automatic recount if the race’s final results show a margin of 0.5 percent or less.

The GOP had expected to win the special election easily, but found themselves up against a high level of Democratic enthusiasm ahead of the midterm elections in November.

Republicans hope to maintain control of the House in November’s midterms, posing a stiff contest to Democrats who have to flip 23 seats in order to win the majority, many of which are in suburban districts similar to Ohio’s 12th District.

Political analysts say Democrats could sweep the House, with handicappers like the Cook Political Report rating more than a half-dozen GOP seats as likely or leaning Democratic in November and dozens of other Republican-held seats as toss-ups.