Can I sue for being repatriated without reason?

You should be able to complain to the embassy, but generally there should be nothing wrong with this kind of thing.

Being expelled belongs to being expelled. When applying for visas from various countries, we will check whether the applicant has any record of being refused entry or deported. If there is a repatriation record, basically, you can't go to any other country without special reasons.

According to international law and practice, whether foreigners are allowed to enter the country is a sovereign act of a country. Even if you have a valid visa and passport, the immigration department of the country of entry has the right to refuse entry and carry out repatriation if it thinks that you do not meet the entry conditions (such as criminal record, lack of economic ability, etc.). ) or suspect that your entry purpose does not match the visa type.