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.

President Donald Trump on Wednesday said he hoped to immediately start work on a nuclear deal with Iran and expressed hope the country would “peacefully grow and prosper” the day after he signed an order to impose aggressive measures on Tehran.