USPS showed a first quarter profit of $226 million. On top of the zealous pension prepayment Congress also requires the USPS to prefund health care payments for postal workers, through to retirement. That's an additional $5.5 Billion out of postal workers pockets.
The answer is not firing postal workers, elimination of Saturday service, or closing post offices. The answer is Congress making an honest accounting of the assets of the USPS.
Republicans plan to make those radical changes by passing H.R. 2309. Contact your Representative and Senators and oppose this bill.