President Trump said Monday that the Washington Post has become a mouthpiece for Amazon and is starting to target him more frequently after the Supreme Court ruled last month that states can force online customers to pay state sales tax for e-commerce purchases.

“The Amazon Washington Post has gone crazy against me ever since they lost the Internet Tax Case in the U.S. Supreme Court two months ago,” Trump tweeted. “Next up is the U.S. Post Office which they use, at a fraction of real cost, as their ‘delivery boy’ for a BIG percentage of their packages….”