7. Ted Cruz (Texas) Cruz has made his concerns clear that Trump issuing a national emergency could be a "slippery slope" for future Democratic presidents to use such powers to declare their policy priorities an emergency. It would make sense that Cruz, an expert in constitutional law, would be uncomfortable with this move, and if it had been done by a Democratic president he'd certainly be among those protesting the loudest about executive overreach. But after a bitter start to their relationship when they were opponents in the 2016 primary, Cruz has come around to being one of Trump's allies...