Haley, in that July meeting, which also included National Security Adviser H.R. McMaster and Vice President Mike Pence, asked the president to let her make the case for decertification

“Let me lay a foundation for it,” she said, according a source familiar with the proceedings. The president agreed.

Haley would become the administration’s most vocal public proponent of decertification—and Trump’s favorite internal voice on Iran—further boosting her standing with the president at a time when she is seen as a potential successor to Tillerson, whose tense relationship with Trump has burst into the open in recent days.