US President Donald Trump authorised the deployment of 300 Illinois National Guard troops to protect federal officers and assets amid ongoing protests in Chicago on Saturday (Sunday AEDT), marking the latest escalation of his use of federal intervention in cities.

The same day, a similar mobilisation of 200 National Guard troops in Oregon was temporarily blocked after a federal judge found Trump was probably overstepping his legal authority in responding to relatively small protests near a US Immigration and Customs Enforcement building in Portland.

Federal officers hold down a protester in Chicago, on Saturday, after protesters learned that US Border Patrol had shot a woman on Saturday morning in Chicago. Credit: Anthony Vazquez/Chicago Sun-Times via AP

White House spokeswoman Abig

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