What do you mean "us", Rep. Harman?

On NPR today, Guy Raz asks Stephen Walt, Richard Perle, and Jane Harman, "What can the next president realistically do on the Israel-Palestine front? What do you think they can do and should do?" Former Rep. Harman's response, beginning at time 7:25 on the recording (my emphasis added):

I think there's an urgency to resolving this problem. I think there's an urgency for Israel, there's an urgency for Palestine, there's an urgency for us, and frankly, as the clock ticks, the ability to protect Israel as a Jewish state declines because of the huge youth bulge in the Arab populations. It's unsustainable. And I have been disappointed, frankly, in our administration, and in the governments of both sides in the region in not making this a higher priority. ... Israel's survival as a Jewish state is very dicey if this doesn't happen.

I thought the official line is that America protects Israel because Israel is a democracy. If demographic changes in Israel are expected to lead to its citizens choosing democratically to end its status as a Jewish state, why should Americans try to stop that?