Last week, Turkey's economy minister said his country does not plan to abide by the USA demand for countries to stop importing Iranian oil, calling the request "nonbinding" on Turkey - a stinging rebuke from a North Atlantic Treaty Organisation ally.
"Absolutely", the president responded when asked if the US would sanction European countries that do business with Iran.
The White House later walked back the president's comments, saying the king said his country can raise oil production if needed.
After the U.S. withdrew from the Iranian nuclear deal in May, it said it would reimpose economic sanctions against Tehran by November.
If Mr Trump's tweets are taken as policy, it means the USA is assuming a 2 million barrel-a-day increase is readily available from the Saudis, a relationship that has already been leveraged "to the maximum extent". "On balance, this leaves the oil market tighter than before, with less spare capacity".
Late last week, Iran's Oil Minister Bijan Zangeneh urged the Organization of Petroleum Exporting Countries (OPEC) to prevent some of its members from increasing output without arriving at a consensus. Tehran, however, vowed on Sunday to foil any USA bid to block its oil exports.
Oil prices fell on Monday as supplies from Saudi Arabia and Russian Federation rose while economic growth stumbled in Asia amid an escalating trade dispute with the United States.
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Oil prices climbed down from their 3 ½ year high to reach US$73 per barrel, with Brent trading at US$76.96 Tuesday afternoon.
And he confirmed that USA secondary sanctions on firms dealing with Iran would "snap back" on August 6 for trade in cars and metals and on November 4 for oil and banking transactions.
US President Donald Trump sent a message on Twitter that he asked Saudi Arabia to increase oil output by 2 million barrels because "prices to (sic) high".
The debate at this time is how to compensate for disruptions in Libya, Venezuela and Iran. Analyst expectations were for a draw of 1 million barrels.
"A fall in the price per barrel won't serve the interests of the big oil producers", Kaddour stressed.
While OPEC leader Saudi Arabia will pick up the slack, Morgan Stanley believes oil markets will be undersupplied by around 600,000 in the second half of 2018. "If production increases as we now forecast, a large share of this would be eroded, leaving the global oil market with a limited "margin of safety", said Morgan Stanley's Rat.
Mr Trump took another swing at his European allies saying they dealt unfairly with the United States over trade.