WASHINGTON (AP) — The U.S. is reassembling key members of the diplomatic team that held secret negotiations with Iran over its nuclear program, leading to a breakthrough agreement, and sending them to Geneva for direct talks with representatives from Tehran in hopes of making progress toward a comprehensive final deal.

The discussions involving Deputy Secretary of State William Burns, Undersecretary of State for Political Affairs Wendy Sherman and Jake Sullivan, Vice President Joe Biden’s top foreign policy adviser, are set for Monday and Tuesday. The European Union’s political director, Helga Schmid, will sit in.