national intelligence director under former president barack obama. >> want to read you part of what the group wrote. it says, quote, whatever one's view on the matter discussed in the whistle-blower's complaint, all americans should be united in demanding that all branches of our government and all outlets of our media protect this whistle-blower and his or her identity. goes on to say, simply put, he or she has done what our law demands. and now he or she deserves our protection. >> for more, we're joined from england by natasha linstadt, professor of government at the university of essex. thanks for joining us. >> thanks for having me. >> as we've been reporting, this second whistle-blower has come forward. this time with firsthand knowledge of the phone conversation between president trump and his ukraine counterpart, backing the claims of the first whistle-blower. how significant do you think all this is? and what could it potentially