A Senate proposal to force banks to shed their lucrative yet risk-laden derivatives units — which is vehemently opposed by Wall Street — is gaining steam, picking up the support of some regional Federal Reserve chiefs with more on the way.

Yet President Barack Obama’s Treasury Department, led by Timothy Geithner, continues to oppose the measure, Senate aides say, who add that Treasury is supporting Wall Street over Main Street by opposing the measure considered of ‘utmost importance’ to financial stability.

‘It shows the access of the major Wall Street banks in the Treasury Department in spades,’ one Senate aide said on the condition of anonymity. Assistant Treasury Secretary for Financial Institutions Michael S. Barr is said to be leading Treasury’s efforts.

Senate aides say that more letters of support from other regional Fed presidents are on the way.

Treasury is joined in its opposition to the measure by the Federal Reserve’s Washington-based Board of Governors and the head of the Federal Deposit Insurance Corporation, Sheila Bair.

Meanwhile, supporters include the longest-serving policy maker in the Fed, Federal Reserve Bank of Kansas City President Thomas Hoenig, Federal Reserve Bank of Dallas President Richard Fisher, Nobel Prize-winning economist Joseph Stiglitz and House Speaker Nancy Pelosi.

Hoenig and […]