President Barack Obama will address the nation from the Oval Office Sunday night, in a 15-minute speech expected to take on last week's shootings in San Bernardino that killed 14 people, as well as the broader threat of terrorism.

According to a statement on WhiteHouse.gov, Obama will "provide an update on the ongoing investigation into the tragic attack in San Bernardino. He will also discuss the broader threat of terrorism -- including the nature of the threat, how it has evolved, and how we will defeat it."

Programming that will be affected by the speech includes Fox's Sunday night lineup, beginning with The Simpsons and Brooklyn Nine-Nine, as well as ABC's lineup, including Once Upon a Time's fall finale. Both networks' shows will be pushed back 15 minutes to accommodate the speech, TVline reports. CBS, which had two episodes of 60 Minutesscheduled, will air a special report anchored by Scott Pelley on the speech, while NBC's Sunday Night Footballpre-game show will also likely be affected, according to Variety.

President Obama's speech will air live Sunday at 8 p.m. ET / 5 p.m. PT.