April 1, 2014
Not exactly but...
1. Congress can delegate rule making authority to government agencies, including agencies that are within the executive branch. For example, Congress delegates to the Department of Transportation the authority to make certain types of rules regarding airport and traffic safety.
2. The President of the United States can issue executive orders. Executive orders tell federal agencies and federal officers to do certain things. Executive orders are often controversial because, as your question suggests, this type of power is normally reserved for the legislative branch. Courts can review the constitutionality of an executive order.