There is a list of things that U.S. citizens can do to lose their nationality. This bill would add to that list: engaging in or purposefully and materially supporting hostilities against the U.S. Hostilities would be defined as any "conflict that is subject to the laws of war." These changes would also come out of amendments to the Immigration and Nationality Act.
Currently, the list of actions that can lead to a person losing their status as a U.S. national include the following acts that “with the intention of relinquishing United States nationality.”:
Obtaining naturalization in a foreign state after the age of 18.
Committing any act of treason against the U.S. like attempting to overthrow the government, or bearing arms against the U.S. This also includes engaging in a conspiracy to overthrow, put down, or destroy the government of the U.S. or otherwise levy war against it.
Taking an oath, making an affirmation, or any other formal declaration of allegiance to a foreign state or its political subdivision after 18.
Entering or serving in the armed forces of a foreign state if those armed forces are engaged in hostilities against the U.S. This includes serving as a commissioned or noncommissioned officer.
Accepting or performing the duties of any office or form of employment under the government of a foreign state or its political subdivision.
Making a formal renunciation of nationality before a U.S. diplomatic or consular officer in a foreign state in a format established by the Secretary of State or by the Attorney General.