UNITED NEWS INTERNATIONAL (UNI) — Shares of e-commerce giant Amazon fell more than 5 percent on Monday, April 2, following yet another Twitter jab from U.S. President Donald Trump.

Trump tweeted, “Only fools, or worse, are saying that our money losing Post Office makes money with Amazon. THEY LOSE A FORTUNE, and this will be changed.”

His market-rattling tweet went on to say retail stores across the country are closing for lack of a level playing field.

Trump previously suggested the United States Postal Service was losing $1.50 for every Amazon package it ships.

While the USPS is losing money overall, experts maintain its Amazon deal is profitable.

This is the second time in less than a week that Amazon stock has plummeted amid Trump’s concerns about the company.

Amazon stock peaked above $1,600 last month, but by Monday’s closing bell, it was trading well below $1,400 per share.