SACHA PFEIFFER, HOST:

It's Day 40 of the government shutdown, the longest in U.S. history, and Americans are feeling the pain through canceled flights and suspended federal food aid. Meanwhile, Senate Republicans and Democrats have been working this weekend to try to fund the government. NPR's Luke Garrett is on Capitol Hill with more on the status of shutdown negotiations. Hi, Luke.

LUKE GARRETT, BYLINE: Sacha, thanks for having me.

PFEIFFER: Any progress today on reopening the government?

GARRETT: That is the million-dollar question. But at this point, no one really knows when the government will reopen, even the senators who are here today trying to find a solution. At the heart of this government shutdown is really a policy disagreement over health care tax credits. On Friday, Demo

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