US President Donald Trump doubled down on his criticism of Nato member states’ refusal to aid Washington’s military operation in the Middle East, while noting that his country would consider selling F-35 fighter jets to Turkey after years of deadlock. In his meeting with Turkish President Recep Tayyip Erdogan on Tuesday, the US president, who arrived in Ankara to attend this year’s Nato summit, said he was “very disappointed” with fellow Nato member states during Washington’s military operation.