The Justice Department has proposed the change as part of a large revision of FOIA rules for federal agencies. Specifically, the rule would direct government agencies who are denying a request under an established FOIA exemption to “respond to the request as if the excluded records did not exist,” rather than citing the relevant exemption.Just imagine that you put in a request and were told that the records didn't exist. You wouldn't pursue trying to find out more. You wouldn't appeal the denial. That is what they're looking to do to inconvenient FOIA requests.
This totally defeats the whole purpose of the law, a law that has been around since 1966. But the Obama administration is above such inconveniences.