MEXICO CITY, Dec 15 (Reuters) - Mexican lawmakers have agreed to postpone debating a divisive new central bank law that critics say could force the bank to buy laundered narcotics proceeds and weaken the bank’s independence, two congressional sources told Reuters on Tuesday. Lawmakers were due to discuss the bill on Tuesday but the Bank of Mexico (Banxico) and some members of Congress, including from the ruling National Regeneration Movement (MORENA), had pushed for debate on the proposal to be delayed until Congress begins a new session in February. (Reporting by Dave Graham; Writing by Drazen Jorgic; Editing by Anthony Esposito)