Trump told a campaign rally in the USA state of MS on Tuesday night.
Trump discussed with King Salman efforts to maintain supplies to ensure oil market stability as crude prices are rising.
Just a few days after the Algiers meeting, Trump blamed OPEC for high oil prices at the UN General Assembly in NY.
In this photo provided by the Saudi Press Agency, King Salman attends a swearing in ceremony in Riyadh, Saudi Arabia, on November 6, 2017.
USA weekly Midwest refinery utilization rates dropped to 78.9 percent, their lowest since October 2015, according to the data.
Since winning the White House, Trump has shaken the foundations of America's post-World War II alliances, questioning the importance of the North Atlantic Treaty Organization, pulling out of a nuclear accord with Iran that European powers helped negotiate and saying in the midst of a trade war that the European Union was a "foe".
"We protect Saudi Arabia - would you say they're rich?"
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Crude still found support from expectations that USA sanctions on Iran will further cut the OPEC country's oil exports, tightening supplies and straining the ability of other major producers. Trump said. "I love the king, King Salman, but I said, 'King, we're protecting you".
Saudi Arabia was the United States leader's first stop during his first global tour as president past year.
Brent crude oil futures LCOc1 were trading at $85.85 per barrel at 0104 GMT, down 44 cents, or 0.5 percent, from their last close.
Meanwhile, U.S. gasoline prices are up ahead of November midterm elections in which Trump already faces political headwinds.
OPEC has so far ruled out any further production increase, beyond delivering the boost agreed in June, despite prices rallying further and more pressure from Trump.
"We have been taking a very close look at the demand signals in the market, and what we have been seeing is not good, JBC Energy said on Wednesday in a note to clients". It was around $50 (€43) a year ago.
He further added, "we defend many of these nations for nothing, and then they take advantage of us by giving us high oil prices. We want them to start lowering prices and they must contribute substantially to military protection from now on".