The central issue is immigration.
Period.
Federal immigration policy is key to the current struggle at the border. What is secure. What’s not. Who the U.S. should admit. Who it shouldn’t. Major questions loom as to what’s going on in Central America. Many lawmakers are questioning what “draws” migrants to cross into the U.S. illegally – prompting debates over detention conditions, health and the care of children.
That’s to say nothing about the expense.