The caution urged by the trio of Democratic presidential hopefuls could mark a shift in the way the debate over America's policy towards Israel, especially as the early stages of the 2020 race give way to the drumbeat of constant campaigning.

\"I think now that you have presidential candidates, even if you have one presidential candidate taking this issue up, I think it will put pressure on the others to follow suit because that's where the base is,\" Shibley Telhami, a professor at the University of Maryland and a fellow at the Brookings Institution, told ABC News in a phone interview Thursday.

\"That's why I think the traditional leadership in the House is really struggling where it never used to,\" Shibley, who has polled on American attitudes toward the conflict for over a quarter century, added. \"It used to be, when this issue came up, it wasn't a priority for anyone, they weren't punished by their electorate. Fundraising-wise more people were in the mainstream than on the left of this issue and so that's where the pressure came from.\"

Public opinion polling shows that sentiments have indeed shifted, especially among Democrats. According to a Pew Research poll conducted last year, Democratic voters sympathize about equally with the Israelis as the Palestinians, with sympathy for Israel dropping 16 percentage points in the last two years.

The statements from Sanders, Harris and Warren come as the party continues to grapple with the best way to deal with the controversy surrounding Omar, a freshman Minnesota lawmaker who last year became one of the first Muslim women ever elected to Congress.

\"PHOTO:
Ethan Miller/Getty Images
PHOTO: Sen. Kamala Harris (D-CA) takes a question during a town hall meeting at Canyon Springs High School, March 1, 2019, in Las Vegas.
>

The latest saga began earlier this week when Omar made comments at a progressive event in Washington, D.C. where she again expressed frustration about the debate over America's support for the Israeli government.

\"For me, I want to talk about the political influence in this country that says it is ok for people to push for allegiance to a foreign country,\" Omar said. \"I want to ask, why is it ok for me to talk about the influence of the NRA, of fossil fuel industries, or Big Pharma, and not talk about a powerful lobby that is influencing policy?\"

The comments sparked concern among Jewish groups and various Jewish members of Congress that Omar was perpetuating an anti-Semetic stereotype that accuses Jews of putting their allegiance to Israel above their loyalty to the United States.

That concern led House Democrats to begin drafting a resolution condemning anti-Semitism, a move supported by members like Rep. Debbie Wasserman Shultz, the first Jewish member of Congress from Florida.

\"Because you have some members who either repeatedly or individually continued to use anti-Semitic tropes – and I’ll give them the benefit of the doubt and say it’s unknowing – then apparently we do need to put a resolution on the floor that educates people about how harmful and hurtful anti-Semitism is,\" Wasserman Shultz told ABC News on Wendesday.

The Minnesota congresswoman also found herself in hot water last month when she implied that congressional inaction on Israel was due in part to the monetary influence that outside lobbying groups like the American Israel Public Affairs Committee (AIPAC) have over American politicians.

Omar later apologized \"unequivocally,\" for her comments, but has consistently defended herself against claims that she is trafficking in anti-Semetic rhetoric.

\"I am told everyday that I am anti-American if I am not pro-Israel. I find that to be problematic and I am not alone. I just happen to be willing to speak up on it and open myself to attacks,\" Omar tweeted last week.

I am told everyday that I am anti-American if I am not pro-Israel. I find that to be problematic and I am not alone. I just happen to be willing to speak up on it and open myself to attacks.

— Ilhan Omar (@IlhanMN) March 3, 2019

ABC News' John Parkinson and Roey Hadar contributed to this report.

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