The best a fence can do is slow down the flow and allow the border patrol to do it's job of capturing illegals. Trump did what he could do and it was working along with policies he put in place to stem the flow. He cannot make congress pass legislation to stop the welfare state that's a magnet for third world people. That's why Trump must have a super majority of conservative Constitutionalists in both houses to pass legislation that will remove the reward for migrating here. Border fences have worked in Hungary and they will work here but only if we do as Hungary did and enforce our borders and take away incentives to invade our country. We also need to remove the threat of money laundering by huge lobby interests that fund the crisis with immigration.