What are the three categories of non-US citizens subject to removal?

The correct response identifies the three categories of non-U.S. citizens subject to removal as arriving aliens, non-U.S. citizens present without admission, and lawfully admitted non-U.S. citizens.

Arriving aliens refer to individuals who are not yet admitted but are seeking entry into the United States. They may be subject to removal if they do not meet the requirements for entry. Non-U.S. citizens present without admission are individuals who are physically in the United States but lack legal status or have entered the country without proper documentation. Lastly, lawfully admitted non-U.S. citizens may also face removal if they violate the terms of their admission or engage in activities that render them removable under immigration law.

This response encompasses a broad range of scenarios that fall under U.S. immigration enforcement policies and addresses the various legal standings of non-citizens, providing a comprehensive understanding of the grounds for removal.