President Trump’s national emergency declaration was met with a slew of lawsuits in federal court, but litigants face potentially insurmountable obstacles as they take their fight over the border wall to the courts.

“All we have so far is a proclamation. We don’t have anything else,” South Texas College of Law professor Josh Blackman told the Washington Examiner. “We don’t have plans of what’s going to be built, where it’s going to be built, what source of money will be utilized first. Until we know those things, I don’t think any of these suits are ripe.”