Warren has concerns about being Clinton's VP: report
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Sen. Elizabeth WarrenElizabeth WarrenWarren calls on big banks to follow Capital One in ditching overdraft fees Crypto firm top executives to testify before Congress Massachusetts Gov. Charlie Baker won't seek reelection MORE (D-Mass.) reportedly has concerns about being Hillary ClintonHillary Diane Rodham ClintonRepublican Ohio Senate candidate slams JD Vance over previous Trump comments Budowsky: Why GOP donors flock to Manchin and Sinema Countering the ongoing Republican delusion MORE's running mate.

Warren, who is expected to endorse the presumptive Democratic presidential nominee soon, was unsure about the prospects of having two women running on the ticket in November, Reuters reported.

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The Massachusetts senator questioned whether the ticket would give Democrats their best chance to defeat presumptive GOP nominee Donald TrumpDonald TrumpGOP grapples with chaotic Senate primary in Pennsylvania ​​Trump social media startup receives commitment of billion from unidentified 'diverse group' of investors Iran thinks it has the upper hand in Vienna — here's why it doesn't MORE, the news service added.

Warren's advisers have reportedly been in contact with the Clinton campaign in recent weeks, but the Massachusetts senator has not yet spoken to Clinton or the campaign about filling the role of vice president.

Warren is also looking to advance her policy priorities, such as reducing income inequality, which she said are "more progressive" than Clinton's. She is not sure a job as vice president would be the best platform on which to advance those issues.

Still, Warren has signaled interest in the possibility of being Clinton's running mate.

In the past, Warren has been a vocal critic of Trump, slamming him on Twitter and vowing to fight so his "toxic stew of hatred and insecurity never reaches the White House."

Trump also attacked the senator, resurrecting charges that Warren falsely claimed Native American ancestry and dubbing the lawmaker "Pocahontas" on the campaign trail.

Sources close to Warren have said the senator's support of Clinton is driven by her desire to keep Trump out of the White House.

Warren had so far remained neutral during the primary. Her expected endorsement of Clinton could help the Democratic Party unify heading into the general election.