There are so many ways around that.
Just one. The day Trump is elected, due to national security issues, we might be required to search every single vehicle/truck crossing into the U.S. I imagine it would back up traffic from from our southern points of entry to Mexico City. But national security is top priority.
Just the fact that you think such an abuse of power would be a good thing tells me all I need to know about the Trump supporters. You truly are the equivalent of the Obama supporters - willing to accept any violation of the Constitution, any abuse of power, as long as it furthers your goals...
But that would make all the GOPe folks sad. Must not interfere with their plans and schedule for full Mexico-Merger.