Trump called Iran's nuclear counter-proposal 'totally unacceptable,' rejecting terms that retain enrichment capabilities and demand war reparations. Here's what it means.

Opinion: For Trump, negotiations with Iran have reached a stage where they are no longer just a question of agreement or war - but of American credibility with Tehran, its Gulf…

Both sides have refused to make concessions and repeatedly threatened to resume fighting, but neither appears willing to return to all-out war. Iran sent its latest proposal in…