Asymmetric responses by the U.S. are a real option, but this comes with a high price. While we could pay this price, Washington would be unable to sustain such an effort indefinitely because of domestic and global political reasons. Israel has been undertaking such operations for many years, with some measurable impact, but the Israelis arguably have the political support at home and the same elements needed for asymmetric warfare that Iran has. Furthermore, the threat of large-scale U.S. military retaliation could quickly broaden the scope of the conflict, with unintended regional economic and political consequences, and still not diminish Iran’s capability to carry out covert attacks on American officials, interests and regional allies.