If he so wishes, the current (and competent) President, George W. Bush, could direct the Attorney General and the Justice Department to prosecute you under the following:
§ 953. Private correspondence with foreign governments.
Any citizen of the United States, wherever he may be, who, without authority of the United States, directly or indirectly commences or carries on any correspondence or intercourse with any foreign government or any officer or agent thereof, with intent to influence the measures or conduct of any foreign government or of any officer or agent thereof, in relation to any disputes or controversies with the United States, or to defeat the measures of the United States, shall be fined under this title or imprisoned not more than three years, or both.
This section shall not abridge the right of a citizen to apply himself, or his agent, to any foreign government, or the agents thereof, for redress of any injury which he may have sustained from such government or any of its agents or subjects.
18 U.S.C. § 953 (2004).
The assumption would, of course, be that as a former [albeit failed] President, you ought to know this law and that if you don't, your ignorance of the law is no excuse.
NOW will you shut the hell up?!