In my work using an unapproved message/email platform to relay confidential information would put me out of a job.
I cannot even believe they were using Signal to discuss a military attack... such incompetence and it really just tears away at the credibility and hopes so many people were given during the campaign.
People can make light of it, but anyone who has ever worked in field that requires confidentiality should see how egregious this is, this is not about being transparent at all.