Obama says Libya's Gaddafi 'greatly weakened'

President Barack Obama said on Tuesday the objective of a US and allied campaign is to apply steady pressure on Libyan leader Muammar Gaddafi so that he will "ultimately step down" from power.

In an NBC News interview, Obama said military pressure and international sanctions have "greatly weakened" Gaddafi. "He does not have control over most of Libya at this point," Obama said. (Reuters)