Former GOP presidential candidate Herman Cain on Saturday broke with President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on his criticism that Amazon hurts the U.S. Postal Service (USPS) with its shipping business, saying "Amazon is not the problem."

"First, Amazon should be left alone, and let the market determine their fate alone with consumers. Secondly, fix the post office. Fix the postal system. It has been losing money for decades and they won't fix the problem," Cain said on Fox News.

Trump lashed out at Amazon on Saturday, renewing his calls for USPS to raise shipping rates for the popular web store that an analysis last year showed receives an average subsidy of $1.46 from the Postal Service for every package it ships.

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While USPS has seen a steady decline in revenue from its mail delivery service over the years, Trump reportedly disputes the fact that the service has made massive profits from Amazon.

"Amazon isn't a problem with the post office, the post office is the problem with itself," said Cain, a retired businessman.

Trump has called the Amazon shipping rates a "scam" while accusing the online retail giant of failing to pay state and local sales taxes and putting smaller companies out of business.

The company does collect such taxes on products sold to buyers in states with sales taxes in place, but does not collect taxes in all states on behalf of third-party sellers who use the company as a marketplace.