Scores of National Guard troops are expected to march through the bustling streets of Chicago, Illinois in coming days.

Their deployment to the US' third-largest city was long foretold.

US President Donald Trump mentioned the plan frequently in recent months — they would be deployed to protect Immigration and Customs Enforcement officers pursuing illegal immigrants, despite Governor JB Pritzker's protests.

On Saturday, local time, he made good on the vow, authorising the deployment of 300 troops to Chicago.

They will be joining dozens of armed federal agents who have already been patrolling the streets of tourist and shopping areas.

The deployment is part of a broader escalation of Mr Trump's federal law enforcement in Democrat-run cities across the country, with Portland, Oregon; Was

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