The Senate returns to debating Iraq with an all-nighter stretching ahead of them and no clear order of amendments to vote on. Senators were told to be ready to cast votes till dawn — it happens extremely rarely.

The focus is on a bill with a firm timeline — a real test for Republicans who say they have had enough. Majority Democrats are trying to force Republicans' hands, but the GOP has threatened to filibuster a plan to require troop withdrawals from Iraq to begin within four months.

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