Final answer:
The Office of Management and Budget (OMB) is responsible for creating the federal budget and advising on fiscal policy, not enforcing immigration laws, which is the role of other executive agencies.
Step-by-step explanation:
The Office of Management and Budget (OMB) is an essential component of the Executive Office of the President, with several key responsibilities, but enforcing immigration laws is not one of them. The OMB's principal functions include developing the federal budget, evaluating the effectiveness of federal programs, advising the President on fiscal policy, overseeing the performance levels of bureaucracies, coordinating and reviewing federal regulations, and delivering executive orders and directives. However, the enforcement of immigration laws is a role typically handled by other executive agencies such as the Department of Homeland Security.