5 CFR § 2635.502 deals with potential conflicts of interests of federal employees. If I'm reading that correctly, it seems that every government agency needs to have at least one "designee" that rules whether an apparent conflict of interest is a real one.
Does the White House itself have such a designee for its staff?
I'm guessing it depends whether the White House is an agency... and the answer seems to be complicated, but probably is "yes" at least in part
The Executive Office of the President of the United States (EOP) is a group of agencies at the center of the executive branch of the United States federal government. The EOP supports the work of the president. It consists of several offices and agencies, such as the White House Office (the staff working directly for and reporting to the president, including West Wing staff and the president’s closest advisers), the National Security Council, and the Office of Management and Budget. Some of these play a very important role in the implementation and regulation of public policy.
The EOP is also referred to as a 'permanent government', with many policy programs, and the people who implement them, continuing between presidential administrations. This is because there is a need for qualified, knowledgeable civil servants in each office or agency to inform new politicians.
So who rules on conflicts of interests according to 5 CFR §2635.502 at least for the EOP?