The court confirms that Miller filed an appeal Monday. Arguments are set for Friday.
Last week, Alaska state court Judge William Carey ruled against Miller in his challenge to how the state conducted the election and counted write-in ballots for his rival, Sen. Lisa Murkowski.
Miller faced a Monday deadline for filing an appeal in light of a tight court schedule.
Unofficially, Murkowski garnered more votes than Miller in the Nov. 2 election, but the state's certification of the results is being held up until while Miller's legal case is resolved.