From the article:
Baker declined to comment through an office assistant, who referred questions about his FISA work to a Justice Department spokesman.
If the Justice Department lawyer refuses to comment, how does the WaPo know what he thinks or how he expressed any reservations about the program?
The reported source for this article is "government officials familiar with the program". I'll give you two guesses about which committee held a closed door breifing on intelligence matters today. They meet again tomorrow, according to their
website.