President Donald Trump has left the impression with foreign officials, members of his administration, and others involved in Iranian negotiations that he is actively considering a French plan to extend a $15 billion credit line to the Iranians if Tehran comes back into compliance with the Obama-era nuclear deal. Trump has in recent weeks shown openness to entertaining President Emmanuel Macron’s plan, according to four sources with knowledge of Trump’s conversations with the French leader. Two of those sources said that State Department officials, including Secretary Mike Pompeo, are also open to weighing the French proposal, in which the Paris...