WASHINGTON — Vice President Joe Biden will take the stage at the Academy Awards show on Sunday to introduce Lady Gaga for her performance of “Til It Happens to You,” an Oscar-nominated song about sexual assault on college campuses from the film “The Hunting Ground.”

Biden is a long-time advocate against sexual assault who authored the Violence Against Women Act. He will urge the Oscar audience to take a pledge to speak out about the issue by visiting www.ItsOnUs.org, his spokeswoman said.

Biden will attend the awards show with his wife, Jill.