Briefly, the wall’s never-ending journey starts as a bill making its way through Congress. Yes, we know, good luck with that. But, for the sake of argument, let’s say the bill authorizing and funding the wall passes through Congress and President Trump signs it into law.

Now the real obstacles begin as the wall confronts its own barrier, the federal bureaucracy.

The first stop is the Department of Homeland Security because, after all, the wall is being built to control immigration and beef up border security. With this enormous maze of an agency largely in charge of the entire project, that right there is a harbinger of failure. In addition, two agencies within Homeland Security would also be involved, the Border Patrol and U.S Immigration and Custom’s Enforcement — since Trump’s wall will have, in his words, “big beautiful doors.”

After getting tangled (or strangled) in Homeland Security, the following is a list of federal agencies and departments that would put their own “bricks in the wall” in the form of studies, regulatory oversight, and guidance.