The police rearrested him on the request of Immigration and Customs Enforcement.

英訳に間違いが有れば正してください。

警察は移民税関捜査局の要請で彼を再逮捕した。
The police rearrested him on the request of Immigration and Customs Enforcement.

答え onをatにする

The police rearrested him at the request of Immigration and Customs Enforcement.

~の要請で
at the request of~