I don’t know this, but CONSTITUTION SAYS IT IS TREASON to work for the interest of another country, …

I don't know this, but CONSTITUTION SAYS IT IS TREASON to work for the interest of another country, is this +Senator Lindsey Graham a TRAITOR? I came to America because we have LAWS, is he above the LAW? working for the interest of another COUNTRY?
http://www.haaretz.com/news/diplomacy-defense/1.634286