Michael Hayden sprang to the defense of retired Navy SEAL Admiral William McRaven, who Trump attacked on Sunday.
Michael Hayden shared a picture of Auschwitz alongside a comment about children being separated from their parents.
Sadiq Khan has called on the British government to cancel Trump's visit later this year.
The Republican Party front-runner is making Americans "less safe," Michael Hayden said.
Bill Harlow, along with former CIA Directors Michael Hayden and George Tenet, and Jose A. Rodriguez, Jr., the former head of the counterterrorism division, have teamed up for a media campaign.