The central bank has encountered criticism for allowing three banks to direct funds to dividends and buybacks even though their capital levels fell below required minimums.
The Senate Banking Committee's top Democrat singled out Morgan Stanley and Goldman Sachs, which he said "got passing grades" despite being unable to maintain minimum required capital levels.
Sens. Elizabeth Warren and Sherrod Brown sought details on whether an OMB official was involved in the policy of separating children from their parents.
The agency has provided new information about changes large and midsize banks are making in the wake of the Wells Fargo scandal, but Senate Democrats continue to press for more details.
