The Trump administration plans to federalise 300 members of the Illinois National Guard, Democratic Governor JB Pritzker said overnight.

Pritzker said the guard received word from the Pentagon in the morning that the troops would be called up. He did not specify when or where they would be deployed, but US President Donald Trump has long threatened to send troops to Chicago.

"This morning, the Trump Administration's Department of War gave me an ultimatum: call up your troops, or we will," Pritzker said in a statement.

"It is absolutely outrageous and un-American to demand a governor send military troops within our own borders and against our will."

The governor's office did not immediately respond to a request for additional details.

The escalation of federal law enforcement in

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