In formal debate all remarks are supposed to be addressed to the president of the deliberative body. In this case "Mr. President" may well be the President of t

In formal debate all remarks are supposed to be addressed to the president of the deliberative body. In this case "Mr. President" may well be the President of the Senate, not the President of the United States. (Disclaimer: I haven't had a chance to listen to the stream yet, so I don't actually know whom Sen. Lee is addressing. In the top remark, Sen. Rand is most likely addressing the President of the Senate.)