We the People...

WaPo:

Kate Martin, director of the Center for National Security Studies at George Washington University, said the secret order may amount to the president authorizing criminal activity.

"It is, I believe, the first time a president has authorized government agencies to violate a specific criminal prohibition and eavesdrop on Americans."

The US. Constitution

Ammendment IV:
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.

Article VI:
"This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.

The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution"

Hat tip to Atrios.