Eric Holder was asked, in a meeting about the 2014 DOJ budget, if the DOJ was monitoring phones of members of Congress.
Holder refused to answer, saying that he'd be glad to answer in the appropriate forum. That clearly says that, in fact, the DOJ did monitor phones used by members of Congress. If such monitoring hadn't occurred, then Holder could have just said no.
The Senator who asked the question, Kirk (R-Il), said, "The correct answer would be to say, 'No, we stayed within our lane, and I am assuring you we did not spy on members of Congress.'"
"Rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law' because law is often but the tyrant's will, and always so when it violates the rights of the individual." Thomas Jefferson