I see no reason why it wouldn't be sustained. And if sustained, a bunch of money once allocated to areas across the country will end up instead being spent in Texas, New Mexico, Arizona, and California. Yippie-ki-yo-ki-yay.
To my knowledge, no presidential declaration of a national emergency has ever been enjoined, let alone sustained. It's one thing to dispute an executive order or action, but it's another to invalidate or issue an injunction against the President who has declared a national emergency. So, precedence is against you. Tell us why you think such an injunction would be sustained. Do you think one unelected federal district court judge should have the power to issue an injunction covering the entire country? Do you think the federal court system at ANY level ought to decide what is and is not a national emergency as it regards national security, or a humanitarian crisis? Should they be deciding what is and is not relevant to national security? Actually, isn't that within the purview of the Congress? And if they delegate that power to the President without parameters, by what authority does the Judiciary overturn that decision?
It's not as if the Congress has not already authorized such expenditures to build a wall/fence/barrier/whatever in the past, you know that right? They authorized it but didn't appropriate the funds to do it, but should that matter in cases of a declared national emergency for security reasons? I assume you also know that past presidents have spent money on some things with Congress did not appropriate money for, called by some "unobligated funds or balances". Unobligated balances are the amounts of budget authority that have not yet been committed by contract or other legally binding action by the government. It is believed that unobligated balances were used by Johnson to help fund his Great Society, by both Johnson and Nixon to help with funding for the Vietnam War, to assist with Carter's expanding domestic programs, to go toward Reagan's work to bring down the Soviet empire, to help fund both Iraq wars by Presidents George H.W. Bush and George W. Bush, and by President Clinton to help him stay within Republican congressional budget limits. So far, neither President Obama or Trump have done that; as a result, there will be an estimated $1.156 trillion in unobligated balances by the end of F.Y. 2019.
https://www.americanthinker.com/art..._with_unobligated_balances.html#ixzz5dvq222s0
These are reasons why such an injunction should NOT be sustained; somebody tell me why it should be. Opinions are nice, but if unsupported they really don't carry a lot of weight. And I am not poking My2 or anyone else in the eye with a stick, but put some meat on those bones.