A Downing Street spokesperson said, The Prime Minister had a telephone call with President Trump earlier today. They discussed Syria, and the appalling humanitarian situation in Eastern Ghouta. They agreed it was a humanitarian catastrophe, and that the overwhelming responsibility for the heart-breaking human suffering lay with the Syrian regime and Russia, as the regime’s main backer. They agreed that Russia and others with influence over the Syrian regime must act now to cease their campaign of violence and to protect civilians. The Prime Minister raised our deep concern at the President’s forthcoming announcement on steel and aluminium tariffs, noting that multilateral action was the only way to resolve the problem of global overcapacity in all parties’ interests.