The White House raised the prospect of open-ended nuclear talks after again missing a deadline. Photo: Matt H. Wade / WikiCommons.

International powers negotiating a nuclear deal with Iran failed to meet another deadline on Tuesday, the second missed target in a week, raising the prospect of an open-ended diplomatic process over an issue on which President Barack Obama has staked his foreign-policy record.

Senior administration officials in Vienna and Washington said progress was still being made and negotiators “have never been closer” to a comprehensive deal to curb Iran’s nuclear program in exchange for lifting international sanctions. Mr. Obama has said talks would end in a deal that reflects a framework reached in April, or with no agreement at all.

Read full story at The Wall Street Journal.