WASHINGTON — Leading senators of both parties have struck a deal over a draft bill that would expand a 1996 war crimes law to give American courts jurisdiction over cases involving atrocities committed abroad even if neither party is a U.S. citizen, in the latest response to Russia’s apparent targeting of civilians in Ukraine.
The idea behind the draft, a copy of which was obtained by The New York Times, is that if someone who committed war crimes abroad later comes to the United States and is discovered, that person could be prosecuted for those actions by the Justice Department. Killings of civilians and the discovery of mass graves in parts of Ukraine that had been occupied by Russian troops have incited an international outcry.
Despite partisan polarization that has generally gridlocked Congress, supporters of the bill — which is chiefly sponsored by the top lawmakers on the Judiciary Committee, Senators Charles E. Grassley, Republican of Iowa, and Richard J. Durbin, Democrat of Illinois — believe the measure has a realistic chance of quickly becoming law.
The senators are still in talks with House members about a possible companion bill and expect to file the measure later this week, committee staff members said.
“The United States must not be a safe haven for war criminals looking to escape justice in their home country,” Mr. Grassley, the bill’s author, said in a statement to The Times. “This bill sends a strong message that people who commit war crimes are not welcome here and should be punished, regardless of where their offense was committed or who they victimized.”
Mr. Durbin said the measure would fill “an egregious gap in our laws” to ensure that foreign war criminals in the United States could be prosecuted.
“Perpetrators committing unspeakable war crimes, such as those unfolding before our very eyes in Ukraine, must be held to account,” he said in a statement. “We have the power and responsibility to ensure that the United States will not be used as a safe haven by the perpetrators of these heinous crimes.”
Two former chairmen of the Judiciary Committee — Patrick J. Leahy, Democrat of Vermont, and Lindsey Graham, Republican of South Carolina — are also lined up to co-sponsor the bill, committee staff members said.
The senators are lobbying their caucuses to support the bill, hoping to pass it by unanimous consent and skip the committee review process.
Talks on the topic are less developed in the House, however.
Enacted by Congress in 1996, the War Crimes Act incorporates part of the international laws of war into American domestic law. The act made it a crime, prosecutable by the Justice Department, to commit a “grave breach” of the Geneva Conventions of 1949.
Grave breaches include willful killing of civilians, torture, biological experiments and “extensive destruction and appropriation of property, not justified by military necessity and carried out unlawfully and wantonly.”
But while similar laws in other countries, like Germany, provide universal jurisdiction over such offenses, Congress in 1996 limited the reach of the United States. The law covers only instances in which an American is the perpetrator or the victim of a war crime.
The bill introduced by Mr. Grassley and Mr. Durbin would eliminate that restriction, making the law cover any situation in which “the offender is present in the United States, regardless of the nationality of the victim or offender.” It would also eliminate any statute of limitations on war crimes, so prosecutions could be brought many years later.
A House committee report in 1996 said that the Pentagon and the State Department had both urged Congress to enact a more universal law along the lines of Mr. Grassley and Mr. Durbin’s bill. But lawmakers decided that would be unwise, worrying that it would create foreign relations issues.
“Domestic prosecution based on universal jurisdiction could draw the United States into conflicts in…