evidence: FACT-CHECK: Mostly false, needs context [...] Two of Trump's top advisers for Middle Eastern affairs also claimed that Iran was supplying Hamas and other Palestinian terror groups with $100 million each year in an op-ed published in 2019. Trump also said that Iran gained $300 billion because the Biden-Harris administration "took off all the sanctions I had" on Iran. [...] According to shipping data, Iran's oil exports-its chief source of revenue-have climbed during the last four years. But experts estimate than Tehran has been able to accrue around $100 billion at most during President Biden's term, which is substantially less than Trump's figure of $300 billion.