The Trump administration is prepared to consider a proposal that allows Iran "token" nuclear enrichment if it leaves no possible path to a bomb, a senior U.S. official told Axios. Why it matters: This suggests there could be an opening, if only a small one, between the red lines set by the U.S. and Iran for a deal to constrain Iran's nuclear capabilities and prevent war. - But at the same time, Trump has been presented with military options that involve directly targeting the supreme leader. Driving the news: U.S. officials say the bar Iran's forthcoming nuclear proposal is very high because the plan would have to persuade the many skeptics inside the Trump administration and in the region. - "President Trump will be ready to accept a…