The Department of Homeland Security warned last week of potential extremist-fueled violence connected to the long-anticipated lifting of Title 42, just days before enforcement of the Trump-era policy was slated to end before the U.S. Supreme Court intervened, CBS News confirmed with multiple law enforcement sources.Since March 2020, federal border officials have cited the law to expel migrants 2.5 million times to their home countries, without allowing them to request asylum, a right protected by U.S. and international refugee law.For nearly three years, the U.S. has used the policy to turn back a majority of adult migrants from Mexico and Central America's Northern Triangle who have been stopped along the southern border.According to the bulletin, "Grievances over immigration policy and animosity toward immigrants have previously fueled extremist acts, including the 2019 Walmart shooting in El Paso, Texas, that killed 23 people and left another 23 wounded.Immigration ranks among a consortium of "hot button" political issues, along with abortion, that continue to motivate extremists, according to senior homeland security officials."