washington u.s. president donald trump may add visit saudi arabia trip europe may first overseas journey since become president senior administration official say wednesday trip discuss official say speak condition anonymity trump already plan attend nato summit brussels may 25 travel sicily group seven leaders summit schedule may 26-28. defense secretary jam mattis riyadh wednesday meet senior saudi officials say hop trip could potentially open door trump visit saudi arabia former president barack obama meet leaders six-nation gulf cooperation council saudi arabia qatar unite arab emirates kuwait bahrain oman year ago trump make middle east fight islamic state focus young presidency order u.s. navy fire cruise missiles syrian airfield chemical weapons attack syria early month saudi arabia powerful deputy crown prince mohammed bin salman meet trump washington march visit tout senior saudi advisor one hail historical turn point u.s.-saudi relations riyadh often fraught relationship obama administration especially wake 2015 iran nuclear deal saudi arabia felt obama administration consider riyadh alliance washington less important negotiate deal rein iran nuclear program white house spokesman sean spic say possible trump visit vatican meet pope francis add schedule european trip reach vatican see visit arrange spic tell reporters possible trump trip saudi arabia discuss u.s. official