Senior officials will brief Tuesday at the Biden administration’s first Iran-focused classified session for all senators, seven congressional staffers and U.S. officials said, coming at a time when relations with Tehran are spiraling and nuclear constraints are weakening.

Outgoing Deputy Secretary of State WENDY SHERMAN, Undersecretary of Defense COLIN KAHL, Deputy Director of National Intelligence MORGAN MUIR, Treasury’s Under Secretary for Terrorism and Financial Intelligence BRIAN NELSON and Vice Adm. STEPHEN KOEHLER, the Joint Staff’s chief of strategy, policy and plans, will be on Capitol Hill at 4 p.m. for the classified briefing.

One person who won’t be there is ROB MALLEY, the special envoy for Iran deal talks, who we’re told is on leave by two people (they, like others, were granted anonymity to freely discuss details of a classified session). His deputy, ABRAM PALEY, will accompany Sherman in his stead.