US President Donald Trump has amplified his promises to send National Guard troops and immigration agents to Chicago by posting a parody image from Apocalypse Now featuring a ball of flames as helicopters zoom over the nation's third-largest city.

"'I love the smell of deportations in the morning,'" Trump wrote on his social media site. "Chicago about to find out why it's called the Department of WAR."

The president offered no details beyond the label "Chipocalypse Now," a play on the title of Francis Ford Coppola's dystopian 1979 film set in the Vietnam War, in which a character says: "I love the smell of napalm in the morning."

In response to the post, Illinois governor JB Pritzker, a Democrat, called Trump a "wannabe dictator".

Trump on Friday signed an executive order seeking to re

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