Mr. President, Mr. Speaker, Members of the Congress of the United States: The gravity of the situation which conf ronts the world today necessitates my appearance before a joint session of the Congress. The foreign policy and the national security of this country are involved. One aspect of the present situation, which I present to you at this time for your consideration and decision, concerns Greece and Turkey. The United States has received f rom the Greek Government an urgent appeal for financial and economic assistance