So which Amendment is it that permits subordination of the Constitution to "safety from terrorism?"

[suston96]

44. Dunno much about "subordinate".......

But what follows is in the Constitution and it "ordinates" the establishment of the United States and the framework - repeat: FRAMEWORK of government required to establish how and why the United States were ordained into a nation:

We the people of the United States, in order to form a more perfect union, establish justice, insure domestic tranquility, provide for the common defense, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this Constitution for the United States of America.

What then follows, I repeat, is only a FRAMEWORK or structure of government, guided by principles and practices of those days and the good sense and inspirations when the Constitution was written by the blessed Founders.

You won't find the precise words and phrases that cover every detail of the government operations to date.

That's NOT what Constitutions do!