Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) late Monday took aim at her fellow Democratic 2020 presidential contenders who attend "fancy fundraisers" instead of campaigning on the ground and focusing on small-dollar donations.

"I don’t spend time at fancy fundraisers," the senator wrote in a tweet.

"Instead, I spend my time meeting voters and thanking grassroots donors who chip in what they can," she added.

"Donate $3 to my campaign, and you might just get a call from me to thank you!" Warren continued.

I don’t spend time at fancy fundraisers. Instead, I spend my time meeting voters and thanking grassroots donors who chip in what they can. Donate $3 to my campaign, and you might just get a call from me to thank you! https://t.co/qvWn3CqUnT — Elizabeth Warren (@ewarren) June 18, 2019

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While not naming any of her almost two dozen competitors by name, Warren's post went live while former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE, largely considered the race's current front-runner, was appearing at a fundraiser in a New York City penthouse apartment.

Nearly 200 people paid at least $2,800 to attend the event, hosted by investor Jim Chanos, according to a reporter traveling with Biden.

Climate change activists reportedly protested outside, urging the former vice president to support a Green New Deal plan backed by some of his competition.

Warren has pledged to avoid high-dollar fundraisers during her primary bid, joining Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) in focusing on small-dollar donations from individual donors to fund her campaign.

The Massachusetts senator has surged in some polling in recent days, and now sits at second place in some polls of early voting states.