President Obama is so “distracted by his vice president’s indiscipline” that he has been forced to rebuke privately Vice President Joe Biden, according to a new book by Newsweek journalist Richard Wolffe, who interviewed Obama a dozen times.

“He can’t keep his mouth shut,” Wolffe quotes a “senior Obama aide” as saying of the gaffe-prone Biden in “Renegade: The Making of a President,” set for release June 2.