Donald Trump will launch the largest migrant deportation operation in US history with “post-inauguration” immigration raids in a Democrat-led “sanctuary city” next week.

Operation Safeguard, the first step in the president-elect’s crackdown, will begin in Chicago on Tuesday, which is the day after Mr Trump is inaugurated, and end on the following Monday.

Hundreds of federal agents were asked to volunteer to take part in the “post-inauguration” operation in a message sent to Immigration and Customs Enforcement agency staff.

About 150 agents are being sent to Left-leaning Chicago, which has refused to hand over detained migrants to federal immigration authorities because it is a sanctuary city, the New York Times reported.