The review was "initiated in response to congressional requests and whistleblower and hotline complaints", the Office of Inspector General said in a statement yesterday.
It said the review would include an examination of "DHS's adherence to court orders and allegations of individual misconduct on the part of DHS personnel."
The review follows widespread protests over Trump's move that invited criticism and outrage at home and from abroad.
Trump signed the order on Friday imposing an indefinite travel ban on Syrian refugees and a temporary curb on people from six other countries - Iran, Iraq, Libya, Sudan, Yemen and Somalia - from entering the US for at least 90 days.
In a significant blow to Trump, a US judge issued an emergency order on Saturday staying deportations for people who have arrived in America with valid visas from seven Muslim-majority nations but were detained on entry due to the controversial immigration ban.
But despite the outcry, Trump defended his controversial decision, insisting that it is "not a Muslim ban" as is "falsely" reported by the media.
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