The vote illustrates the sentiment on Capitol Hill to preserve six-day mail delivery, which is especially popular with older voters.
It's estimated that allowing the Postal Service to end Saturday deliveries would save it about $1 billion a year.
The provision has been carried for decades as part of a spending bill with jurisdiction over the Postal Service but was originally left out this year after GOP leaders pressed allowing the Postal Service to go to five-day delivery. The agency's budget is kept separate from the rest of the government.
The companion Senate measure contains the longstanding provision requiring Saturday mail.
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