President-elect Donald Trump is weighing options for stopping Iran from being able to build a nuclear weapon, including the possibility of preventive airstrikes, a move that would break with the longstanding policy of containing Tehran with diplomacy and sanctions.

The military-strike option against nuclear facilities is now under more serious review by some members of his transition team, who are weighing the fall of the regime of President Bashar al-Assad—Tehran’s ally—in Syria, the future of U.S. troops in the region, and Israel’s decimation of regime proxy militias Hezbollah and Hamas. Iran’s weakened regional position and recent revelations of Tehran’s burgeoning nuclear work have turbocharged sensitive internal discussions, transition officials said. All deliberation on the issue, however, remains in the early stages.

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