(Reuters) -U.S. Senator Elizabeth Warren raised fresh questions about President Donald Trump's pick to fill an open seat at the Federal Reserve, demanding on Tuesday that Stephen Miran explain a discrepancy in filings to the U.S. Office of Government Ethics disclosing income that his spouse received.

Warren demanded answers in a letter issued less than 24 hours before the Republican-majority Senate banking committee's scheduled vote, at 10 a.m. EDT on Wednesday, to advance Miran's nomination for consideration by the full Senate.

Warren, the banking panel's top Democrat, opposes Miran's confirmation. She and other members of her party say that his decision not to resign as White House economic advisor compromises his ability to make decisions on monetary policy that are independent of the president, who has made no secret of his desire for lower interest rates.

In a February 2025 OGE filing when he was nominated for his current job as chair of the Council of Economic Advisors, Miran reported $1.4 million in income attributed to his spouse from a for-profit university called East Coast Polytechnic Institute.

However, seven months later he reported spousal income of $457,954 from ECPI. That was included in his latest OGE filing, dated September 3, 2025.

"Particularly given the history of reputational quality issues, underhanded operations, and opaque funding structures associated with for-profit universities, the nature of your spouse's - and by extension your - relationship with ECPI deserves full clarity," Warren wrote in the letter, a copy of which was seen by Reuters.

"Further, the discrepancy raises questions about the reason for the change and the accuracy of the disclosures in your OGE forms."

The White House and ECPI president had no immediate comment.

In a letter following up on Miran's confirmation hearing last week, Warren had asked Miran about his and his spouse's relationship with the university, and several other assets reported on his disclosure form as real estate assets that "support ECPI."

Miran, in his response dated September 7, said he had "provided all required financial information" to the ethics office and had entered into an ethics agreement "that describes the steps that I will take to avoid any actual or apparent conflict of interest in the event that I am confirmed for the position of Governor of the Board of Governors of the Federal Reserve System."