It's really important to understand that behind this is not just the national security apparatus that is always looking for threats - there's also a powerful industry that has made huge amounts of money in the last two decades, and is now using climate change to argue for more military and border spending. Quite a few of the big military and border firms have a lot of influence in the corridors of power, they are lobbying constantly for increased spending on borders. Many of these same border firms also provide services to the fossil fuel industry.