The US Supreme Court in Washington, DC, on June 6, 2022.
CNN  — 

The Department of Homeland Security is warning that threats in the US could become even more volatile throughout the summer and midterm election season, fueled by election year misinformation and potential violence surrounding an upcoming Supreme Court ruling on abortion rights.

“Threat actors have recently mobilized to violence due to factors such as personal grievances, reactions to current events, and adherence to violent extremist ideologies, including racially or ethnically motivated or anti-government/antiauthority violent extremism,” a National Terrorism Advisory System bulletin issued Tuesday said.

“One of the key upcoming events that we are worried about are first and foremost the mid-term elections,” said a senior DHS official. The official noted that those harboring grievances over the 2020 election and fueled by misinformation may feel compelled to respond to the election season using violence.

“As the United States enters mid-term election season this year, we assess that calls for violence by domestic violent extremists directed at democratic institutions, political candidates, party offices, election events, and election workers will likely increase,” the bulletin, obtained by CNN, said.

Another key event of concern: A final Supreme Court opinion in a case that stands as a direct challenge to Roe v. Wade’s holding of a federal constitutional right to an abortion. Votes and language can still change before the final opinion, which is not expected to be issued until late June, b