U.S. Sen Bernie Sanders (I-VT) asked the National Security Agency in a letter Friday if it had spied on members of Congress.

Sanders cited recent revelations that the NSA has collected information on American citizens, actions that he called “clearly unconstitutional,” and spied on foreign leaders.

“I am writing today to ask you one very simple question. Has the NSA spied, or is the NSA spying, on members of Congress or other American elected officials?” he wrote in the letter to NSA director Keith Alexander.

Sanders said “spying” would include collecting so-called “metadata” — which includes date and times of phone calls, along with length and duration — as well as the content of Internet history and emails.

The full letter is below.

Sanders NSA Letter by tpmdocs