Mahmoud Khalil, the Columbia University graduate who has been in immigration detention in Louisiana for more than a month, was barred from attending the birth of his firstborn child Monday, after immigration officials denied him permission to attend the birth in person, according to emails reviewed by CNN.

On Sunday morning, attorneys for Khalil wrote to Melissa Harper, director of the US Immigration and Customs Enforcement field office in New Orleans, requesting that Khalil be released from detention for two weeks so he could travel to New York and be with his wife when she delivered their son.