Challenging jurisdiction is one of the best defenses you can make, because if you use the right argument it is almost impossible for you to loose!
If they attempt to tell you that you can't question their jurisdiction you can easily shut them up with court rulings!
"Once jurisdiction is challenged, the court cannot proceed when it clearly appears that the court lacks jurisdiction, the court has no authority to reach merits, but, rather, should dismiss the action." Melo v. US, 505 F2d 1026.
"There is no discretion to ignore lack of jurisdiction." Joyce v. U.S. 474 2D 215.
When would one use this? Can you give an example?
