US president tweeted that his visit to Saudi Arabia was "already paying off" as Gulf states accused Qatar of funding terrorist groups.
Brent, WTI slide further as Doha calls for dialogue with irate neighbouring countries.
Diplomatic relations have worsened between Arabic state and neighbours.
Decision by several Saudi-led Middle Eastern nations to sever ties with Qatar would have far reaching implications from flights to football.
President Trump's arms deal with Saudi Arabia was "instrumental" in the re-emergence of the crisis.
Saudi Arabia, UAE, Egypt and Bahrain sever ties with Qatar amid claims Doha supports terrorism.
The four countries have accused Doha of destabilising the region and supporting terrorist groups like the Muslim Brotherhood.
Black Crows shows women and children living under the jihadists and tackles subjects such as mass murder and rape.
Tensions in the Gulf still present after alleged fake news article allegedly appeared.
The newly re-elected Iranian president said there can be no stability in the Middle East without Tehran's cooperation.
Donald Trump had criticised the Clinton Foundation for accepting Gulf donations
To some, Trump is "a hero" and "a brother", to others "an idiot with no policy but terrorising" and "a man who spreads war, chaos and killing among people".
Women face severe restrictions in the world's most gender-segregated nation.
Brent, WTI futures jump as market prices in fresh output cuts by major oil exporters.
The excursion will be watched closely, by allies and opponents.
Blogger Raif Badawi was arrested in 2012 for insulting Islam, and sentenced to 10 years and 1000 lashes.
Trump has set himself up for some awkward meetings during his first overseas tour.
There are strict rules for women on what they can wear in Saudi Arabia
Kingdom's interior ministry banned 50 names deemed as 'inappropriate and offensive' in 2014.
Trump will use the trip to rally support against Isis and lobby for Middle East peace.