The Democrat trailing in a North Carolina congressional race withdrew his concession on Thursday as state election officials investigated allegations of absentee ballot fraud.

Dan McCready’s reversal came as a top leader at the state’s Republican party said it would support a new election in the unresolved ninth congressional district race if an investigation showed that wrongdoing swayed its outcome.

Unofficial totals have the Republican Mark Harris leading McCready by 905 votes. But the state elections board refused to certify the results last week because of allegations of “irregularities and concerted fraudulent activities” involving mail-in ballots in the district. The board is meeting later this month to hear evidence, but it is unclear whether the race will be settled then. The board could order a new election.

McCready, an Iraq war veteran who outraised Harris in the campaign, initially conceded the day after the election, when Harris’s lead was less than 1,900 votes. The margin was cut by half the next week, but he declined to seek a recount. He changed his mind with the arrival of the allegations, some of which have been linked to a man who worked for Harris’s chief strategist.

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“I didn’t serve overseas in the Marine Corps just to come back and watch politicians and career criminals attack our democracy,” McCready said. “That’s why today I withdraw my concession to Mark Harris, who’s remained completely silent.”

At issue is who can handle completed ballots. North Carolina law allows only a family member or legal guardian to drop off absentee ballots for a voter.

In affidavits offered by the state Democratic party, some Bladen county voters have described that people came to their homes to collect their absentee ballots, whether or not they had been fully completed or sealed in an envelope to keep them from being altered.

A state election board spokesman confirmed on Thursday that subpoenas seeking documents had been sent to the Harris campaign; the Red Dome Group, which worked for Harris; and the campaign committee of the sitting Bladen sheriff. The board released documents showing that McCrae Dowless, the contractor hired by Red Dome, seems to have collected the most absentee ballot request forms in Bladen county this fall. Dowless has a felony criminal record.

“I call on Mark Harris to tell us exactly what he knew and when he knew it,” McCready said. The Harris campaign and Red Dome founder Andy Yates didn’t respond to an email seeking comment. A campaign lawyer said this week that it wasn’t aware of any illegal conduct in the ninth District race. Harris said last week that his victory should be finalized while the board investigated.

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Earlier on Thursday, the state GOP executive director, Dallas Woodhouse, texted a statement to the Associated Press saying that the GOP would back a new election if the state’s elections board were to show that absentee ballot issues changed the outcome.

“If they can show a substantial likelihood it could have changed the race then we fully would support a new election,” he said.

However, he said that if the investigation showed that the outcome would not have been changed, Harris should be certified the winner.

Amid the developments, the US House Democratic leader, Nancy Pelosi, said on Thursday the House “retains the right to decide who is seated” and could take the “extraordinary step” of calling for a new election if the winner isn’t clear.