McConnell now says he will support the full $600 if Trump does.
The deal-making is being done between the White House (Meadows, Mnuchin), Pelosi, and Schumer. They have announced they are trying to reach a deal by the end of the week.
The White House put a $400 FPUC payment through early December on the negotiating table. Pelosi and Schumer hold firm at $600 and a longer duration as they continue negotiations over the entire deal.