"My understanding is that he received due process in a full and transparent trial and the sentence was carried out," Toner said in response to a question.
The Washington Post also praised the Indian Government for carrying out this execution in secrecy.
"In a country where few things remain secret, where everything is argued in public, and where courts take decades to complete trials, Kasab's swift hanging was a welcome surprise for many," the daily said.
25-year old Kasab was hanged at 7.30 am in the Yerawada central prison in Pune on Wednesday.