It's off topic, but the legal status of lobbying in the US always baffles me. Today I learned It's entirely legal for a company to lobby a congressman, but not a government department. How does that make any sense at all?
A department or agency of the federal government acts within the laws and regulations set by congress and is overseen by the president. Thus, even if you wanted them to do or change something, they could not. Congress on the other hand is set up to listen to and respond to constituents (constitutionally), and thus lobbying congress is entirely legal as that it what you are supposed to do.