WASHINGTON — The Trump administration on Thursday asked the U.S. Supreme Court to suspend limits on deporting immigrants to countries where they are not citizens, escalating a dispute over what safeguards people must receive before removal. Solicitor General D. John Sauer filed an emergency request seeking to block a ruling by the 1st U.S. Circuit Court of Appeals. That decision prevents the administration from relying only on broad assurances from receiving countries that deportees will not be tortured, persecuted or sent onward to another country where they could face harm. The appeals court also found that people in detention must have more than one day to raise fears about being sent to a country that was not identified as a possible destination during their deportation proceedings. The administration has expanded so-called third-country deportations as part of President Donald Trump’s mass-removal campaign. The policy targets people whose home countries will not accept them, as well as people who have received protection from being returned to places where they face torture or persecution. The administration has sought other countries willing to receive them, in some cases offering financial compensation or other concessions, according to the filing and court history described in the case. Sauer argued that the court rulings have disrupted diplomatic arrangements. He said nearly 220 planned removals had been called off and dozens more were at risk, warning that the disruption could force renewed negotiations with countries that may become less willing to cooperate. The 1st Circuit’s ruling largely upheld a district judge’s decision in favor of people facing deportation. After a senior Department of Homeland Security lawyer publicly questioned whether the appeals court’s decision was in effect, immigrant rights advocates returned to the circuit court. On Wednesday, the court clarified that its ruling was operative. The Supreme Court has previously sided with the administration in emergency appeals involving third-country removals. The current request is assigned to Justice Ketanji Brown Jackson, who ordered lawyers for the deportees to respond by Monday at 4 p.m. The Justice Department also asked that, if Jackson does not immediately grant its request, the full court consider it. The justices’ decision could determine whether the administration can continue removals under its current process while the legal challenge proceeds, or whether people must receive additional opportunities to raise individualized concerns about the danger they may face in a country they may have never lived in.