The highest-ranking participant was former White House chief of staff and retired Marine Gen. John Kelly, who told CNN that because of a prior commitment he was only able to “monitor” about 10 minutes of the call, which lasted about an hour.

Other participants included former Trump White House communications directors Alyssa Farah Griffin (now a CNN political commentator) and Anthony Scaramucci, former Homeland Security and counterterrorism adviser to Vice President Pence Olivia Troye, former Department of Homeland Security official Elizabeth Neumann, and former Director of the Cybersecurity and Infrastructure Security Agency Chris Krebs, among others. Stephanie Grisham, who first publicly discussed this group a couple of weeks ago on CNN’s “New Day,” was not on the call because she was sick with Covid-19, though she told CNN she is engaged with the group.

None of the names CNN has learned were involved with the call were particularly surprising; from Kelly to Farah to former national security adviser John Bolton, all have spoken publicly in one degree or another about their concerns about Trump’s leadership and fitness for the office. But one participant said that what struck many about the call was the sight of “a lot of faces I had not seen speaking publicly about why Trump is dangerous. People who had not previously spoken out who were now willing to speak out and share their perspective.”