The United States Postal Service warns it could run out of cash within a year unless Congress approves financial reforms. Here's what to know.

The U.S. Postal Service will tell Congress on Tuesday it faces a serious financial crisis and will run out of cash in less ​than a year in the absence of significant reforms.

The U.S. Postal Service faces massive losses and may run out of money next year, prompting a congressional hearing and debate over its priorities.