According to Axios, the Trump Administration has informed Israel that the United States will not directly participate in any kind of military strikes against nuclear facilities in Iran, though officials did not clarify if that included indirect support such as intelligence and aerial-refueling for Israel’s Air Force. 

Analysts believe that without U.S. participation, an Israeli operation against Iran’s nuclear enrichment sites would likely be limited, possibly requiring several days of bombing due to the Israeli Air Force not maintaining any kind of long-range strategic bomber like the U.S. Air Force’s B-2 or B-52. 

These bombers would be needed for their ability to carry large “bunker buster” bombs such as the GBU-57A/B  MOP (Massive Ordnance Penetrator) that would likely be required in order to hit Iran's primary facility for enriching weapons-grade uranium, the Fordow Fuel Enrichment Plant (FFEP), which is built into a mountain over 80–90 meters underground near Qom.

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