Funding for the Department of Homeland Security is expected to shutter at the end of this week as congressional Democrats barter with the White House over immigration enforcement, one of the most politically explosive issues this Congress has weighed to date.

Republican appropriators had a deal to modestly reform Immigration and Customs Enforcement that would have allocated new money for body cameras and de-escalation training. Senate Democrats tanked that deal, however, after a second U.S. citizen was killed in an altercation with federal agents in Minneapolis last month.