TalkSport is investigating comments made by Jon Gaunt to councillor Michael Stark during his regular phone-in show on Friday.
The two were involved in a live debate about Redbridge Council's unanimous vote to ban smokers from becoming foster parents.
Gaunt, who was in care as a child, went on the offensive during the debate calling the councillor a "Nazi" and "ignorant pig", causing several listeners to call in and complain.
The presenter later backtracked his remarks, calling the councillor a "health Nazi" and offered an on-air apology at the end of the programme. Gaunt was later suspended from his programme.
In a statement, a TalkSport spokesperson said: "TalkSport has taken the decision to suspend Jon Gaunt while the matter is investigated.
"When we have all the facts at our disposal, we will take whatever action, if any, that we deem appropriate."
Gaunt also wrote a column for The Sun about his time spent in foster care, which was published the same day he interviewed Stark.
Gaunt wrote: "The woman who rescued me from care, and undoubtedly turned me around as a child, smoked like a chimney but she was also a hospital matron."
The column also included some controversial comments along the same theme as the ones that caused his suspension at TalkSport.
"[The] zealots who dreamed up this policy will sleep easy on their futons because they are putting the 'health needs' of kids in care first.
"This is the same warped logic that condemns black children to a life in care rather than let them be fostered by white couples.
"The same master race philosophy that forbids fat couples from adopting.
"The SS -- that is social services by the way -- think the risk from passive smoking is more dangerous to a child than them being left to rot in a children's home."
Gaunt's agent, Nick Canham, told The Independent that the comments had been misrepresented.
In May, TalkSport sacked veteran presenter James Whale after he breached Ofcom's impartiality rules when he urged listeners to "vote Boris" in his regular late night talk show.
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