Donald Trump warned Turkish president Recep Tayyip Erdoğan on Wednesday that his country will ‘pay a very big economic price if it doesn’t treat Syrian refugees and Kurds ‘humanely’ as it sends tanks and ground troops into their country – but couldn’t say what his measuring stick might look like. ‘We’re going to have to see. We’re going to have to define that as we go along,’ the president told reporters at the White House, hours after declaring that he doesn’t approve of the invasion. Trump will welcome Erdoğan to the White House next month. He said Turkey’s leader aims to send millions of Syrians ‘back to where they came from’ but didn’t offer details about how smoothly that could possibly go. ‘In all fairness to him,’ Trump said, ‘he’s holding millions of people that would be all over the place if he wasn’t holding them. So he wants to repatriate [them].’ ‘We’ll see how he does it. He could do it in a soft manner. He could do it in a very tough manner. And if he does it unfairly he’s going to pay a very big economic price.’ Asked what he thought about holding the threat of economic sanctions…