Senate health committee Chairman Lamar Alexander said Tuesday there were “zero” odds of Congress passing legislation to try to stabilize Obamacare if it isn’t included in a must-pass spending bill this week.

The Tennessee Republican’s comments to reporters come as Congress tries to finish a two-year omnibus spending package, expected to be released later Tuesday night. Alexander noted that if the stabilization package, which is aimed at compensating Obamacare insurers to reduce premiums, isn’t included, it could have a lasting impact on the Washington healthcare debate.