Buchanan debated Natan Sharansky on Meet the Press and states what he believes is the cause for anti-American terrorism:

BUCHANAN: In my judgment, what happened on 9/11 was a result of interventionism. Interventionism is the cause of terror. It is not a cure for terror. The idea that the president of the United States, as he said in his inaugural, is going to help democratic institutions in every region in every nation on earth is a formula for permanent war, Tim. And look, the president of the United States has no constitutional authority to do this. Where in the Constitution do we get the right to intervene in the internal affairs of countries that do not threaten us and do not attack us?

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BUCHANAN: The president of the United States was profoundly mistaken. He has misdiagnosed the malady. He has misdiagnosed the reason for the attack, Tim. The United States was not attacked because we are free. Bin Laden was not attacking the Bill of Rights. We were attacked because the United--over here because the United States' military and political presence is massive over there. Bin Laden in his fatwah, his statement of declaration of war on the United States, said the infidels were standing on the sacred soil of Saudi Arabia. They want us out of the Middle East. They don't care whether we have a separation of church and state.

MR. SHARANSKY: America was attacked because it is the leader of the free world and the world of terror where the values are very different. So it is a danger.....

BUCHANAN: We brought down the shah and we got the ayatollah. You bring down that Saudi monarchy, you destabilize that regime and Howard Dean, an Arab Howard Dean, is not going to rise out of the wreckage.

Meet the Press Transcript