Senate Democrats say they are unwilling to fund the Department of Homeland Security without major reforms, raising the likelihood of a partial government shutdown at the end of this week.

Senate Homeland Security Committee Chair Rand Paul (R-Ky.) has sent letters to the heads of Immigration and Customs Enforcement (ICE), Customs and Border Protection (CBP) and U.S. Citizenship and Immigration Services (USCIS) to testify before his committee amid growing public controversy over immigration enforcement operations in Minneapolis and other communities.

Voting against the funding bill may do little to curb ICE in the short term. Here's why:

Four Illinois members of Congress have been allowed into a suburban Chicago immigration processing center that’s been at the forefront of an immigration crackdown. Their tour on Monday comes after

U.S. Rep. Joe Neguse (D-Colorado) says members of Congress are again being denied access to conduct oversight of immigration detention facilities. A federal judge last month sided with Democratic U.S.

U.S. District Judge Jia Cobb in Washington, D.C., concluded that the Department of Homeland Security didn’t violate an earlier court order when it reimposed a seven-day notice requirement for congressional oversight visits to Immigration and Customs Enforcement facilities.

Protests over ICE could complicate the already delicate issue of government funding. Lawmakers are reportedly considering leveraging funding for ICE in exchange for critical reforms.

Most Americans believe President Trump's crackdown on immigration is going to far, according to a new Reuters/Ipsos poll.