"Jabara v. Webster (1984) and U.S. v. Troung, the NSA does have that power "
I've just read Jabara v. Webster and cannot find where wiretapping is involved at all. This is about mail and the Freedom of information act as far as I can see.
http://www.usdoj.gov/osg/briefs/1990/sg900940.txt
U.S. v. Troung seems to involve local law enforcement and methamphetamine manufacture not domestic spying
http://www.kscourts.org/ca10/cases/2005/10/04-5094.htm
Am I looking at the wrong cases or did you perhaps give the wrong cite?
This case you cite is a brief filed on behalf of one Todd Patterson in Patterson v. FBI, not Jabara v. Webster. It is not a ruling by a court, nor is it case law.
http://www.kscourts.org/ca10/cases/2005/10/04-5094.htm
Yes that is the wrong case, the one in reference was filed prior to 2002, in the 6th Circuit Court of Appeals, not the Tenth. I will try and dig up the actual case as I have only read briefs, not the actual case. My Bad - though from what I see from other legal pundits the position taken that these rulings support the NSA's postion seems very solid.
http://www.fas.org/irp/agency/doj/fisa/092502sup.html