(Bloomberg) -- Elizabeth Warren says President-elect Donald Trump is already violating promises hemade to voters by filling his transition team with “Wall Streetelites” and corporate lobbyists.

Related: The fiduciary rule's future underTrump

“The American people are watching to see if you were sincere inyour campaign promises to look out for the interests of workingfamilies, rather than the interests of the rich and powerful,"Warren, a Democratic senator from Massachusetts, wrote in a Tuesdayletter to Trump. “Unfortunately, you already appear to befailing.”

Related: Day after election, 401(k) trading hitsall-time high

Trump repeatedly pledged to “drain the swamp” in Washington onthe campaign trail, saying he would strip power from lobbyists,political insiders and powerful corporations.

Media reports, including those saying that Trump could nominateformer Goldman Sachs Group Inc. executive Steve Mnuchin to beTreasury Secretary, raise questions about whether he will stick tohis promise, Warren said.

She said she would be happy to provide recommendations to Trumpabout who he should hire to help with the transition as well as whoshould staff his administration, according to the letter.

Spokesmen for Trump didn’t immediately return an e-mail seekingcomment.

Warren’s scrutiny of Trump’s transition advisers contrasts withstatements made Monday by President Barack Obama, who said theincoming president needs “room and space” to put his administrationtogether.

Warren said the Trump advisers who especially concern herinclude David Malpass, a former executive at Bear Stearns Cos., andPaul Atkins, a former member of the Securities and ExchangeCommission who was tapped to review financial regulators.

Warren said that she would oppose Trump “every step of the way”if he fails to remove the individuals she specified.

Copyright 2018 Bloomberg. All rightsreserved. This material may not be published, broadcast, rewritten,or redistributed.