No. I told you what it means. "Probable cause" is not a standard for surveilling non-American citizens. There is no standard.
And American citizens talking to these up-to-no-good non-citizens have to be surveilled right along with them.
I will ask again: do you believe terrorists have the protection of the Constitution? And, if you say they should, why should they?
Where does this come from? I have not found it in the Constitution.
Before you get too deep in this, search the Constitution for "person" versus "citizen". You will find that the BOR applies to person, not citizens.