Lord Strathclyde, who leads the Tory peers, thinks the debate should now focus less on the composition of the House of Lords and more on its functions.
Changing the composition of the House of Lords is, however, likely to alter both the way the Lords operates and the balance of power between it and the Commons.
In the Lords (from 3pm) questions to ministers cover childhood obesity, reducing sugar consumption and whether the government intends to make any reforms of the composition of the House of Lords.
Even if Republicans win majorities in both the House and (less likely) the Senate, the composition and ideology of the electorate will not have changed.