An immigrant can be deported from the United States for a variety of reasons, including:

1. Immigration violations: This includes overstaying a visa, entering the United States illegally, or violating the terms of a visa or green card.
2. Criminal convictions: An immigrant convicted of certain crimes, including drug offenses, domestic violence, and aggravated felonies, can be deported.
3. Fraud or misrepresentation: If an immigrant is found to have provided false information or documentation during the immigration process, they can be deported.
4. Public safety or national security concerns: If an immigrant is deemed to threaten public safety or national security, they can be deported.
5. Failure to appear in court: If an immigrant fails to appear for an immigration hearing, they can be ordered deported.
6. Health-related grounds: If an immigrant has a communicable disease that threatens public health, they can be deported.

It’s important to note that the deportation process can be complex, and individuals facing deportation may have options to challenge their removal. If you or someone you know is facing deportation, it’s important to speak with an experienced immigration attorney to understand your legal options.