Sadly, yes, Article 1, Section 9 states, "The privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it." Habeas corpus is a concept of law, in which a person may not be held by the government without a valid reason for being held. A writ of habeas corpus can be issued by a court upon a government agency (such as a police force or the military). Such a writ compels the agency to produce the individual to the court, and to convince the court that the person is being reasonably held. The suspension of habeas corpus allows an agency to hold a person without a charge. Suspension of habeas corpus is often equated with martial law.
Because of this connection of the two concepts, it is often argued that only Congress can declare martial law, because Congress alone is granted the power to suspend the writ. The President, however, is commander-in-chief of the military, and it has been argued that the President can take it upon himself to declare martial law. In these times, Congress may decide not to act, effectively accepting martial law by failing to stop it; Congress may agree to the declaration, putting the official stamp of approval on the declaration; or it can reject the President's imposition of martial law, which could set up a power struggle between the Congress and the Executive that only the Judiciary would be able to resolve.