Aerial footage showed a large group of demonstrators marching through downtown Chicago Wednesday night, in the wake of President Donald Trump's deployment of federal troops to an Army training center outside the city.

It is the latest in the political and legal battle with Democratic elected officials over the president’s plan to deploy the Guard in U.S. cities.

Democratic Illinois Gov. JB Pritzker has said some 300 of the state’s Guard troops were to be federalized and deployed to the nation’s third-largest city, along with 400 others from Texas.

Pritzker has denounced Trump’s plan to put troops on the ground, saying in a lawsuit that it is “unlawful and dangerous.”

Trump claims troops are needed to protect federal immigration enforcement efforts and crack down on crime.

A court hearing is scheduled for Thursday on a request by Illinois and Chicago to declare the Guard deployment illegal.

The American Civil Liberties Union of Illinois has also sued Trump and the U.S. Department of Homeland Security, alleging that U.S. Immigration and Customs Enforcement and several of the agencies’ leaders have unleashed a campaign of violence and intimidation against peaceful protesters and journalists during demonstrations outside an ICE detention facility in Broadview, Illinois.

Federal agents have repeatedly fired tear gas, pepper balls and other projectiles toward crowds at the facility, which sits about 12 miles (19 kilometers) west of Chicago.

At least seven people have faced federal charges after being arrested in those clashes.