Trump news: President imposes 'hard hitting' sanctions on Iran as White House put on lock down

Donald Trump has signed into force new "hard-hitting" sanctions against Iran, including Supreme Leader Ayatollah Ali Khamenei as tensions continue to rise between Washington and TehranMr Trump said that the issue of the US drone downed by Iran last week “could probably add that into this” but that the sanctions were “something that was going to happen anyway.”The president is also facing criticism on multiple fronts as the week begins, including domestic outcry over the treatment of migrant children held in “filthy” border detention centres. Meanwhile, questions have been raised after documents were released showing the president's transition team "red flagged" the appointed of a senior general for a top administration post over his opposition to the use of torture.After postponing the mass deportation of immigrants at the request of Democrats over the weekend, the president gave an interview to NBC’s Meet the Press in which he fielded questions about possible Russian election hacking in 2020, the state of the US economy, and the murder of Washington Post journalist Jamal Khashoggi.Meanwhile, as Mr Trump went after Iran, the 2020 race to take on the president is in full swing.The biggest headlines of the day on that front came from Bernie Sanders and Pete Buttigieg. Mr Sanders drove the day by introducing an ambitious plan to make public college and universities free — and a significant reduction in American student loan debt.Mr Buttigieg, meanwhile, faced conflict in South Bend, where an officer involved shooting of a black man has laid bare the racial tensions in that city and across the country.Please allow a moment for our liveblog to load