Victoria Toensing, Washington lawyer and name partner of diGenova & Toensing, LLP has an interesting and concise article here analyzing the powers of the president when acting in the interest of national security. She concludes, based upon forty years or more of court decisions, that portions of the act that created the so-called "FISA court" are an unconstitutional infringement on executive power.
In the same issue, Stanley Brubaker traces the contortions courts have performed after the Supremes unfortunate Mapp decision here.