The Office of Government Ethics (OGE) sent a letter to the White House Thursday raising concerns about a possible ethics violation by top White House aide Stefan Passantino.

Five Senate Democrats wrote to the top ethics watchdog group after Passantino delivered to the media the White House's legal position on the employment status of Carl Icahn, a billionaire adviser to President Trump. Passantino, who lists Icahn among his former clients, is required to recuse himself from personnel matters regarding any individuals for whom he previously worked.

The Senate Democrats alleged in their letter that Passantino violated an ethics rule in delivering the legal position.

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The letter is signed by Sens. 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 (D-Mass.), Sheldon Whitehouse Sheldon WhitehouseThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime MORE (D-R.I.), Tom Carper (D-Del.), Elijah Cummings (D-Md.) and Patrick Leahy Patrick Joseph LeahyBipartisan representatives demand answers on expired surveillance programs Democrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy MORE (D-Vt.).

Passantino works for the White House as its agency ethics official tasked with ensuring compliance of conflict-of-interest provisions imposed by Trump in January.

In the OGE's response to the senators, the agency's director wrote that he lacked the information to proceed with the investigation and asked White House counsel Don McGahn to look into the issue further.

"OGE lacks the information needed to assess this news report," director Walter Shaub wrote. "Specifically, OGE does not know whether Mr. Passantino participated in the formulation of the White House's legal position."

"However," Shaub continued, "the White House is in a position to ascertain the relevant facts and is responsible for monitoring its appointees' compliance with ethics requirements.

"Therefore, by copy of this letter, I am bringing this matter to the attention of the Counsel to the President for his review."