The White House and Defense Department have, for the last several years, been trying to "explore a new formula for our overseas presence." That's polite language for a permanent presence in the Middle East, based on "status of force agreements" (SOFAs) with countries like Pakistan. A recent diplomatic exchange between the United States and Pakistan provides a window into this campaign.
The United States has learned a hard lesson about democracy and constitutionalism. No declaration of war sanctioned the Iraq war. No Constitutional principle justified the warrantless wiretaps. No American law or treaty allowed Guantanamo Bay. All of these mistakes have hurt, not helped, the real fight against domestic and international terror.
There's another word for a SOFA: treaty. According to the US Constitution, the Senate must ratify any treaty. Using a different word than "treaty" does not change that obligation. The United States is asking Pakistan for permission to operate militarily inside Pakistan, while granting immunity to US personnel for any of their actions during these ventures.
Robots don't enforce the Constitution; people do. Those people--in Congress and the Supreme Court--are ultimately responsible for both any failure to uphold the Constitution, and any consequences that follow.