US Joint Chiefs Chairman Dan Kane argued to Trump administration aides that military options in a war with Iran are limited and an exit strategy is needed. This is because airstrikes alone would make it difficult for President Trump to achieve his goals, and there are concerns that escalating military conflict could have the opposite effect. US troops are running dangerously low on ammunition stockpiles, and Middle Eastern officials have warned that the lack of America's core air defense systems will make it difficult to stop Iranian attacks. While President Trump has opposed deploying ground troops, aides are looking for other options, judging that airstrikes alone will not be enough to bring Iran to the negotiating table.