President Donald Trump has dismissed the assessment of U.S. spy agencies that Iran wasn't building a nuclear weapon before the latest conflict with Israel.

Texas, on Tuesday defended President Donald Trump’s authority to order a limited strike against Iran without first seeking permission from Congress. “A single bombing run, historically, has not been understood to require congressional authorization,

Just how close is Iran to developing a usable nuclear weapon? That question is at the heart of the Iran-Israel conflict -- and one that's driving how President Donald Trump responds -- but Iran's nuclear capabilities are still very much shrouded in mystery.