Villaraigosa’s reversal could put pressure on the stadium to negotiate with USC, which is threatening to move to the Rose Bowl.

With USC threatening to move its home games to Pasadena’s Rose Bowl, Los Angeles Mayor Antonio Villaraigosa called for a long-term deal to keep the Trojans in the Memorial Coliseum, saying for the first time he has given up hope of the National Football League returning to the aging stadium.