New Hampshire officials to investigate AI robocalls that impersonate Biden.

Voters in New Hampshire received robocall messages this weekend with a voice most likely artificially generated to mimic President Biden's, urging them not to vote in Tuesday's primary, the attorney general's office said.

The fake recordings, which told listeners that “your vote makes a difference in November, not this Tuesday,” were manipulated to appear as if they were sent by a Democratic committee official, the agency said.

The attorney general's office emphasized that voting in the primaries do not exclude voters to also vote in the general election in November.

“These messages appear to be an unlawful attempt to disrupt the New Hampshire primary and suppress New Hampshire voters,” the office said in a statement. “New Hampshire voters should completely ignore the contents of this message.”

Disinformation and political experts have raised concerns that such misleading audio, known as deepfake, could become widespread this election season. Last year, the Republican National Committee used the technology to generate a video with images of doomsday scenarios after Mr. Biden announced his re-election bid. Florida Gov. Ron DeSantis posted fake images of former President Donald J. Trump, his political rival, with Dr. Anthony Fauci, the former health official.

State lawmakers are rushing to draft bills to regulate the political content produced by artificial intelligence, which has already been used in tight foreign elections to mislead voters.

“The political deepfake moment has arrived,” Robert Weissman, the president of the progressive watchdog group Public Citizen, said in a statement. “Policymakers must rush to implement protections or we will face electoral chaos.”

In New Hampshire, the attorney general's office began an investigation into the robocall allegations after a complaint from Kathleen Sullivan, a former chair of the state Democratic Party. In her complaint, Ms. Sullivan said the recipients of the unauthorized robocalls saw her husband's name in their caller ID and were given her personal cell phone number to call to request removal from the calling list.

Ms. Sullivan, the treasurer of a political committee that is pushing voters to write in Biden's name in Tuesday's vote, wrote in her complaint that “these types of tactics, if left unpunished, will only get worse in the future .”