From the Document: "On April 15, 2021, Senator Elizabeth Warren [hyperlink] and Representative Adam Smith introduced legislation [hyperlink] that declared, 'It is the policy of the United States to not use nuclear weapons first.' Other Members of Congress are divided on this issue. Senator Dianne Feinstein has argued [hyperlink] that the only moral use for U.S. nuclear weapons is as a deterrent to their use. Senator Deb Fischer, on the other hand, has said [hyperlink] that the proposal 'betrays a naïve and disturbed world view.' President Biden has spoken [hyperlink], in the past, about his support for a 'sole purpose' [hyperlink] policy for nuclear weapons, which some see as similar to 'no first use,' but the President has not yet taken steps to review or alter U.S. nuclear policy. A 'no first use' policy would represent a change from current policy, where the United States has pledged [hyperlink] to refrain from using nuclear weapons against most non-nuclear weapon states, but has neither ruled out their first use in all cases nor specified the circumstances under which it would use them."
CRS Report for Congress, IN10553
Congressional Research Service: https://crsreports.congress.gov/