A valid visa does not protect from deportation. Obtaining a nonimmigrant visa into the United States is a privilege and not a right. So, a foreign national can be deported even with a valid visa. If the conditions of the visa are violated, the US government can revoke that visa and deport them.
- For example, if there is found to have been fraud or misrepresentation in the original application process, that becomes a valid ground for revoking their visa even if they are in the US and they are law abiding. They could still be deported.
- If someone is found to have violated the conditions of their stay, such as working without authorization or committing crimes, those are clear violations, and the government can revoke their visa and deport them.