He warned that "we are not going to put up with these disgusting prices much longer".
"How about our military deals where we protect rich nations that we don't get reimbursed?"
Trump issued the remarks during a rally in MS last week.
Speaking at a campaign rally in Mississippi, Trump had said, "I love the king, King Salman, but I said, 'King, we're protecting you. You have to pay for your military", Trump said. As early as 2015, Trump said Saudi Arabia should have to pay more if it wants USA protection.
He underscored that Riyadh "will pay nothing" to Washington for Saudi Arabia's security, adding that "all the armaments we have from the United States of America are paid for, it's not free armament".
I do not know why some Arab media figures, and maybe some Saudi ones, chose to focus on a certain part of Saudi Crown Prince Mohammed bin Salman's interview with the Bloomberg.
"Ever since the relationship started between Saudi Arabia and the United States of America, we've bought everything with money", he said.More news: F1: Lewis Hamilton wins Japanese GP, Sebastian Vettel finishes sixth
He stressed that Saudi-U.S. relations were good, saying "If you look at the picture overall, you have 99 percent of good things and one bad issue". When Trump arrived in Riyadh in May 2017, jets flew overhead as King Salman met him at the airport.
According to Amnesty International, Saudi Arabia's public prosecutor is seeking the death penalty against her and her husband, and three other rights activists.
The interview also covered recent reports about planned financial aid from Saudi Arabia, the UAE and Kuwait for neighboring Bahrain.
Although Saudi Arabia's ties with the USA have improved under Trump, the president's latest remarks were unusually harsh and appeared to question the stability of a monarchy in power since the 1930s. "His is a voice of reasoned criticism and wise comment that the Saudi crown prince should listen to".
The Gulf country froze trade ties, blocked grain imports, expelled the Canadian ambassador and ordered Saudi students studying in Canada to return home in August after Ottawa issued a tweet in Arabic calling for the release of individuals detained under a crackdown the kingdom claims is related to citizens acting as foreign agents.
If Aramco had developed a separate petrochemical business, Sabic would have definitely suffered, Prince Mohammed said, partly because Aramco provides Sabic with the bulk of the fuel it processes into chemicals. And Saudi Arabia and OPEC and non-OPEC countries, they've produced 1.5 million barrels a day.
Prince Mohammed said he hoped to raise a record $100bn selling a 5% stake.
"The 33-year-old crown prince went on to say that Saudi Arabia had agreed to buy $110 billion worth of USA weapons and signed investment deals worth billions more, some "$400 billion" in total, since Trump took office in early 2017, and described the deals as "a good achievement" for Trump.
"So you can not have 100 percent friends saying good things about you, even in your family".