* Republicans seek ways to put brakes on Dodd-Frank
* CFTC, SEC without new funding until March, at earliest
* Representative Neugebauer: review before agencies expand
By Dave Clarke and Roberta Rampton
WASHINGTON, Jan 3 (Reuters) - Republicans in the new U.S. Congress could put the budget squeeze on two powerful regulatory agencies to slow President Barack Obama's crackdown on Wall Street.
A Democratic-controlled Congress pushed through the Dodd-Frank bank reform laws last year and regulators were counting on a big budget boost to police the $600 trillion over-the-counter derivatives market -- blamed for much of the excess behind the 2007-2009 financial crisis.
But the last Congress failed to deliver on the funding, and that will be even harder to obtain with Republicans vowing to cut spending as they take control of the House of Representatives and boost their rolls in the Senate.
Republican say they want to review the expansion plans of regulators. "Once you