De Blasio has said he wants to hear more specifics from Clinton before making a decision.
Read more from our conversation with Tanden below.
1] The number of people, according to a recent ABC News-Washington Post poll, who see Hillary Clinton as trustworthy has dropped in recent months. Does this alarm you? And you are informally advising Clinton, so if it is a problem, what is your advice for her?
NT: No. Being involved in the political process these days creates some degree of tarnish on a candidate's character attributes. But in terms of animating voting intentions, I think the most important question is who do you trust to fight for you? To get the job done for you? To improve things for you? And through the course of this campaign, that question will have a clear answer for voters and it will be Hillary.
2] Let's talk about New York Mayor Bill de Blasio, who ran Hillary Clinton's first campaign for the Senate. You were Clinton's deputy campaign manager at that time, so you must have worked with both closely, yes? Do you find it odd that he has not endorsed her?
3] Should Hillary Clinton make herself more available to the press? Is she taking enough questions?
NT: It's a long campaign, we still have 500 days and I expect folks will have heard plenty from her in interviews as well as direct speeches by the end of it.
NT: One could have said that about the Roosevelts, but I happen to think Franklin Roosevelt was one of our country's greatest presidents. It would have been a pity if calls like that in 1932 kept him from the White House.
5] All right, putting you on the spot here. Who do you think are the three most likely vice presidential Democratic nominees?
NT: Well, putting me aside, it's hard to pick only three. Just kidding. I will leave that to others as I think it's bad luck to think beyond the primary.
Neera Tanden will appear on "This Week" tomorrow.