WEST PALM BEACH, Fla. — President Trump escalated his assault on Amazon on Saturday, accusing the online retail giant of a “Post Office scam” and falsely stating that The Washington Post operates as a lobbyist for Amazon.

In a pair of morning tweets sent during his drive from his Mar-a-Lago estate to the nearby Trump International Golf Club, the president argued that Amazon costs the U.S. Postal Service billions of dollars in potential revenue.

Trump has repeatedly advanced this theory, even though officials have explained to him that Amazon’s contracts with the Postal Service are profitable.

The president also made clear that his attacks on Amazon were inspired by his disdain for The Post’s coverage. He labeled the newspaper “the Fake Washington Post,” and demanded it register as a lobbyist for Amazon. The Post operates independently of Amazon; the news organization is personally owned by Jeff Bezos, the founder and chief executive of Amazon.

In Trump’s first of two Amazon tweets, sent at 8:45 a.m., he wrote: “While we are on the subject, it is reported that the U.S. Post Office will lose $1.50 on average for each package it delivers for Amazon. That amounts to Billions of Dollars. The Failing N.Y. Times reports that ‘the size of the company’s lobbying staff has ballooned,’ and that . . .”

The president continued with a second tweet sent seven minutes later: “. . . does not include the Fake Washington Post, which is used as a ‘lobbyist’ and should so REGISTER. If the P.O. ‘increased its parcel rates, Amazon’s shipping costs would rise by $2.6 Billion.’ This Post Office scam must stop. Amazon must pay real costs (and taxes) now!”

Trump also criticized California Gov. Jerry Brown, D, for pardoning five ex-convicts facing deportation. He tagged Fox News Channel in his tweet, indicating his comment was inspired by a segment he watched on the network.

Trump tweeted, “Governor Jerry ‘Moonbeam’ Brown pardoned 5 criminal illegal aliens whose crimes include (1) Kidnapping and Robbery (2) Badly beating wife and threatening a crime with intent to terrorize (3) Dealing drugs. Is this really what the great people of California want? @FoxNews.”