Elizabeth Warren is backing a hot investing startup that's taking on Wall Street

Screen Shot 2016 12 06 at 4.05.04 PMFacebook screenshot.Elizabeth Warren wrote a statement on Facebook backing Betterment’s CEO.

Senator Elizabeth Warren is backing the CEO of a hot new finance startup.

The senator wrote on her Facebook page Tuesday that she agrees with Betterment CEO Jon Stein, who wrote an open letter to President-elect Donald Trump over keeping the new fiduciary rule.

She made the comments linking to Business Insider’s Monday story about Betterment’s letter to Trump.

Warren has long backed the new rule, which the Department of Labour passed earlier this year and which makes it much harder for conflicted financial advisors to work in their own interests over their clients when managing retirement money.

Betterment, which provides index funds, bought full-page ads in the print editions of the Wall Street Journal and the New York Times earlier this week urging Trump to uphold the rule.

While Trump hasn’t indicated his view either eay, one of his advisors, hedge funder Anthony Scaramucci, has said that Trump would repeal it.

Some Wall Street firms, such as Morgan Stanley, are preparing for the rule to be delayed off its planned April start date.

In a research note, UBS wrote Monday that it is “more confident” in its expectation for a delay.

The note also said that Morgan Stanley has “developed alternate plans” in case it doesn’t have to comply with the new rule.

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