The United States and Iran have begun a third round of nuclear talks, entering what experts describe as a more difficult phase of technical negotiations this weekend as Washington lays out its conditions.

Secretary of State Marco Rubio says Iran must give up all nuclear enrichment if it wants to make a deal during talks with the Trump administration and head off the threat of armed conflict

Talks are set to start at expert-level, which will begin drawing up a framework for a potential nuclear deal, ahead of an indirect meeting between the lead negotiators. Trump, in an interview with Time magazine published on Friday,