Ads on social media supporting Democratic candidate Doug Jones have provoked concerns about voter intimidation for claims that suggest ballots cast in the upcoming election could become public.

The ad calls Republican candidate Roy Moore "a child predator." Moore has been dogged by allegations that he dated and made sexual advances toward teenage girls when he was in his early 30s, which he has denied.

"Your vote is public record, and your community will know whether or not you helped stop Roy Moore," says a voice in the ad.

Alabama Secretary of State John Merrill said his office has received complaints about the ad.

"We have seen the contents of the ad and it is voter intimidation," Merrill said.

Adam Muhlendorf, a spokesman for Highway 31,the political action committee that produced the ad, said it contains no misinformation.

"The Secretary of State is distorting the intent of the ad," Muhlendorf wrote in a statement. "Whether or not someone votes is public knowledge. The ad is not improper."

John Bennett, spokesman for the Office of the Alabama Secretary of State, issued a statement explaining state law about anonymous ballots.

"When voters cast a ballot the State of Alabama's voter registration system is updated to document the election that a voter participated in but no record is ever made documenting the candidate for whom the ballot was cast," the statement read. "In the Alabama Primary and Primary Run-off Elections a record is made which would indicate whether a voter had voted in either the Democrat or Republican party race but the name of the candidate for whom the voter cast their ballot is never recorded."

On Dec. 12, voters will chose between two candidates for one senate seat.

"In Alabama, voters do not provide political party affiliation when they register to vote because the state does not track that information," according to Bennett's statement.

The ad is funded by Highway 31, a PAC that supports Jones.

Merrill said the suggestion in the ad is wrong.

His office never discloses who voters choose. Public records do include whether or not a person is registered and if they participated in an election.

The Alabama Secretary of State's Office has no authority to investigate allegations of voter intimidation in an election for U.S. senate, Merrill said. He said his office would forward information to federal authorities with jurisdiction over the campaign.

The Washington Post recently published a story about Highway 31 and the PAC's efforts to avoid disclosing donors before the Dec. 12 special election.

The group has spent about $2 million on ads supporting Jones. The group did not accept donations before Nov. 22, according to the Post, and instead delayed paying its advertising bills. That tactic allows the group to avoid reporting its donors until after the Dec. 12 election.

Updated at 5:39 with a statement from Highway 31