According to the US Senate homepage, this is the statement regarding the VP and his position. Apparently, the Sith Lord disagrees with the Sentate. Look for the Senate to be disbanded and a new law to take hold throughout hte new empire.
U.S. Senate During the twentieth and twenty-first centuries the vice president’s role has evolved into more of an executive branch position, and is usually seen as an integral part of a president’s administration. He presides over the Senate only on ceremonial occasions or when a tie-breaking vote may be needed.