U.S. President Donald Trump has approved a National Guard deployment to Memphis, expanding the federal government’s efforts to crack down on what he has cast as out-of-control crime in Democratic-run cities.

"I’m signing a presidential memorandum to establish the Memphis Safe Task Force, and it’s very important because of the crime that’s going on,” Trump said at the White House on Monday as he approved sending troops to the city.

"We’re going to be doing Chicago probably next,” Trump said, citing another city he has claimed is beset with violence and disorder, and added that he was looking at St. Louis and New Orleans as well.