An official at a leading progressive grassroots organization that is closely allied with Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE’s presidential campaign said Friday that the Massachusetts Democrat and rival Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) are in a category all to themselves, compared to the rest of the Democratic primary field.

“Elizabeth Warren and Bernie Sanders are in a class unto themselves among the field,” Adam Green, who is a co-founder of the Progressive Change Campaign Committee, told Hill.TV, noting that both are “fighting for a bold, transformational progressive candidacy.”

But Green noted that they are some key differences between the two progressive heavyweights, insisting that Warren would be one of the few candidates who would be able to fill the entire executive branch on day one of taking office.

“She has been working with these people — the state regulators, the environmental regulators, the anti-corporate crusaders in state after state after the last decade,” he told Hill.TV. “Her mantra is ‘personnel is policy’ and she would be ready on day one to fill the entire executive branch.”

The Trump administration was notably slower to full jobs in the executive branch than past presidents.

After 100 days in office, Trump had several key policymaking positions left unfilled, putting him behind many of his predecessor’s, including Barack Obama Barack Hussein ObamaDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE and George W. Bush.

Since then, Trump has faced scrutiny over its rate of turnover among senior level officials.

According to a report by the Brookings Institute, Trump had more cabinet turnover in the first two and a half years of his presidency than his last five predecessors, including Obama, George W. Bush, Bill Clinton William (Bill) Jefferson ClintonHarris: Ginsburg 'absolutely' cleared the path for me Anxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report MORE, George H.W. Bush, and Ronald Reagan, did in their entire first terms.

Numerous department and agencies have heads serving on an acting basis, though the president has said that he prefers to have it that way.

Green’s comments come as Warren steadily rises in the polls.

A Reuters/Ipsos survey found that Warren is the only 2020 Democratic presidential candidate to consistently increase her level of support over the past six months.

Despite this growing momentum, the Sanders campaign has avoid any direct attacks on Warren. The two progressive heavyweights have instead teamed up on the debate stage to defend their progressive agendas.

—Tess Bonn