Israel's defense minister says his country continues to have differences with the U.S. over Iran's disputed nuclear program.

Ehud Barak says "the clock is ticking at a different pace" for the U.S. and Israel, suggesting disagreements remain on the timeline for any attack on Iran's nuclear facilities.

Barak spoke Thursday hours after meeting the U.S. Vice Chairman of the Joint Chiefs of Staff, Adm. James A. Winnefeld. Earlier this week, Israeli officials said the sides were working closely in hopes of getting their positions in sync.

Israel believes time is running out to stop Iran from acquiring nuclear weapons. The U.S. opposes any Israeli military action right now.

Israel and the U.S. both believe, however, that Iran is trying to develop nuclear weapons. Tehran denies the charge.

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