Trump pushes major oil executives to invest big in Venezuela
Exxon CEO says South American country 'uninvestable' without major changes
Trump withdraws US from dozens of international organisations
Order pulls Washington's support from climate, gender and labour entities
Marco Rubio and Saudi Foreign Minister Prince Faisal meet in Washington
Visit comes day after Prince Faisal met Massad Boulos, US senior adviser for Arab and African Affairs, to discuss Sudan
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