US President Donald Trump returns to Washington DC after his holiday break at his Mar-a-Lago resort in Palm Beach, Florida. Walking across the South Lawn, the president waves at reporters but does not comment or take questions. He has warned Iran that the US is "targeting" 52 Iranian sites and will strike "very fast and very hard" if Tehran attacks Americans or US assets. His remarks follow the US assassination of Qasem Soleimani, a top Iranian general, in a drone strike.