Holding a passport from a country that the U.S. does not have a good relationship with.
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Having a flagged passport typically refers to a situation where a person's passport is marked or identified by authorities for special attention or scrutiny. This could be due to a variety of reasons, including legal, security, or administrative concerns.
It means that your passport has been checked by some form of airport/airline security and that you have answered their “security” questions satisfactorily. The sticker indicates that you are cleared for your flight.
For most travellers going through customs is simply a matter of answering a few questions and then being sent on your way. But certain things can make customs officials more suspicious and may get you flagged for a more thorough inspection.
You can call the National Passport Information Center at 1-877-487-2778 or 1-888-874-7793 (TDD/TTY) to check on your status. The center is open Monday through Friday from 8 a.m. to 10 p.m., Eastern Time, excluding federal holidays. You can use the automated system to check your passport information 24 hours a day.
As a U.S. citizen, you can stay abroad for as long as you wish and always have the right to return. CBP officers must admit a U.S. citizen. That's true even if you were to visit a country where U.S. law restricts travel, such as North Korea or Cuba.