Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) is blasting her Republican colleagues for brushing off ethics rules for President-elect Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s Cabinet picks.

In an op-ed published Thursday in The Washington Post, Warren said there was “no secret that I have deep reservations about the policy views of many of these nominees.”

“But before we can debate and vote on whether these nominees’ policy positions make them suitable to run important parts of our government, it is critical that each nominee follows basic ethics rules,” she wrote, "to ensure that they will act for the benefit of all the American people and not simply to boost their bank accounts.”

Warren cited Tuesday’s hearing with Trump’s pick for Education secretary, Betsy DeVos, who is an heir to the Amway fortune, noting that DeVos has not yet provided financial disclosures or completed her ethics agreement.

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"Without the necessary information, we were unable to fully question the nominee about her many potential conflicts of interest,” Warren said.

"And after depriving the American public of even the most basic information on the nominee, Republicans further undercut a thoughtful examination by cutting the hearing short despite several senators pressing to ask additional questions."

During Tuesday’s hearing, Democrats including Sen. Patty Murray Patricia (Patty) Lynn MurrayTrump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Wash.), the ranking member of the Health, Education, Labor and Pensions Committee, insisted that the hearing should have been delayed until the Office of Government Ethics sent a letter about DeVos’s ethical agreements.

"I am extremely disappointed that we are moving forward with this hearing before receiving the proper paperwork from the Office of Government Ethics," Murray said Tuesday. "When President Obama entered the White House, Republicans insisted on having an ethics letter in hand before moving to a hearing.”

In her op-ed, Warren suggested DeVos could return for another hearing after she completes her ethics agreement.

"If those hearings have occurred, nominees who have not completed their ethics reviews should return for another round of questions after that information is made available,” she wrote.