Unfortunately, because it's his second reentry, it will be very difficult to fight the case. If he already has one deportation then now he is subject to expedited removal which means he can be deported again without even seeing an immigration judge. What he can try is when he gets to ICE detention, send a request for what is called a stay of removal. He would submit that request directly to his assigned deportation officer once he has one. To apply you submit form I-246 together with a written explanation of why he should be allowed to stay; explain how his US citizen children and you will suffer. If possible, you can also marry him while he is detained because that will give him one more US citizen relative in the US to base his case on ,if you are a US citizen. You can also submit letter of recommendation from people and proof of his rehabilitation. If he does anything good for the community or churches, provide letter. You can find the application and instructions here https://www.ice.gov/sites/default/files/documents/Document/2014/ice_form_i_246.pdf
If this is approved, he will be allowed to stay for one year. He can apply again when it expires.
Good luck to you during this process and I hope this answer has helped you!
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