President Trump revoked security protection for his former secretary of state, Mike Pompeo, and a former top aide despite warnings from the Biden administration that both men faced ongoing threats from Iran because of actions they took on Mr. Trump’s behalf, four people with knowledge of the matter said on Thursday.

Trump revoked security from three national security officials — including his former secretary of state — and Dr. Anthony Fauci this week. When asked about his decision, he told reporters: “You can’t have a security detail for the rest of your life because you work for government.”