The State Home department sent the recommendation at 1500 hrs and it was approved at 1700 hrs.
Sengar was taken to the CBI headquarters in Hazaratganj in Lucknow.
The probe has been handed over to the Central Bureau of Investigation.
The CBI registered three separate cases in connection with the alleged rape and detained Sengar for questioning in the early hours today.
Yesterday, the court had asked the Advocate General whether the state government proposes to arrest Sengar.
According to reports coming in, BJP MLA from Unnao, Kuldeep Sengar can be arrested anytime soon. Next morning, her father died under police custody, with autopsy suggesting a number of injuries on his body.
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Katie Pladl was born to her mother and Steven Pladl in 1998 and was adopted by a family out of state, according to court papers. Steven and Katie Pladl reconnected in 2016 when she moved into his home with her mother and their two kids outside of Virginia.
"The respect that is being given to the accused is because he is an MLA... he is not a convict so far".
The incident led to massive political furore and public outrage.
"Special Investigation Team took mine and the girl's mother's statements, we cooperated with them", victim's uncle told the media on Thursday evening. The court also observed that based on the prevailing situation, it would be compelled to say in its order that the law and order situation in Uttar Pradesh has collapsed.
In an press conference Principal secretary (home) Arvind kumar and DG police, tried to give impression of promptness of the government action against it's own party MLA, but failed to satisfy scribes, want to know that even after registering a FIR under POSCSO, why the MLA was not arrested.
Two doctors have been suspended and disciplinary proceedings initiated against three others for laxity in providing the victim's father with proper medical care and treatment prior to his judicial custody and at the district hospital, Kumar said.
The teen rape survivor demanded immediate arrest of the MLA, saying the CBI probe could be conducted later.
A 17-year-old had accused the BJP MLA and his brother of gangraping her last year, and alleged that the authorities did not pursue the case to bring her justice.