(CNN) Republican candidate Mark Harris plans to ask a North Carolina court Thursday to certify the results of the state's unsettled 9th Congressional District election, his attorney told CNN.

Harris leads Democrat Dan McCready by 905 votes in unofficial tallies of the race, but the state elections board has repeatedly refused to certify the results, instead spending more than a month investigating accusations that an operative for a firm hired by Harris was involved in illegal absentee ballot-collection schemes.

Harris' move comes after North Carolina elections staff had to postpone a previously scheduled hearing into accusations of ballot fraud in the race.

"We've been expecting a hearing, but now we have no choice," Harris' attorney David Freedman told CNN. "We're not trying to circumvent the state board's investigation, but we do want it to move along as quickly as possible."

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