Months before immigration agents flooded into Minnesota, the Trump administration outlined its grievances against state and local officials in a lawsuit that accused them of engaging in “an active and deliberate effort to obstruct federal immigration enforcement.”

The claims in that lawsuit, which remains unresolved, have been echoed by President Trump and his allies in recent weeks as some 3,000 agents descended on the state, where they have arrested thousands, clashed with residents and shot three people.

The Trump administration is correct that certain state and local policies limit cooperation on immigration enforcement, yet the details of those policies are complex and vary depending on location. The Democrats who lead Minnesota have defended their limits on cooperating with federal agents as lawful and in line with the state’s values.

The reality is that Minnesota’s state and local governments have a patchwork of rules that go much further to limit coordination on immigration than in many Republican-led states, but stop short of the comprehensive statewide restrictions on cooperation in other Democratic-run states like California, Illinois and Oregon.

As political and legal fights continue, here’s what you should know about Minnesota’s immigration policies:

State prisons coordinate with ICE

Minnesota prisons routinely hand over inmates who are in the country illegally to Immigration and Customs Enforcement agents when they complete their sentences.

Under Minnesota law, the state’s Department of Corrections must notify ICE officials when an immigrant convicted of a felony is set to be released. Last year, prison officials turned over to ICE 84 inmates who had finished sentences and were leaving the prison system, according to the state agency.