A Conservative Party vice-chairman reportedly backed police brutality during the London riots.
Ben Bradley, the MP for Mansfield, was given the role of Tory vice-chairman for youth by Theresa May last week.
But the 28-year-old has faced criticism for comments he has made in blog posts in the past, including one suggesting benefit claimants should have vasectomies.
During the riots which hit London and other UK cities in 2011, The Times reported that Mr Bradley wrote: “We need to come down hard on these morons before somebody gets killed!
“If we have any sense as a nation we’ll stay home tonight and make it easy for the police to find the ones hanging around town centres with their faces covered. For once I think police brutality should be encouraged!”
Mr Bradley, who was elected last June, apologised for his “inappropriate” language.
“I wrote a number of blog posts when I was in my early 20s and I accept some of the language I used was inappropriate and I apologise for that," he said.
“They were written at a different time of my life – getting married, becoming a father and now being an MP have changed my outlook.”
In a blog post in 2012 backing vasectomies for people on benefits, he had written that it would not be long “before we’re drowning in a vast sea of unemployed wasters”.
After those comments emerged, a No 10 source said he would remain in his job, adding: “Mr Bradley has apologised for those comments. The PM thinks it is right that he did so.
“I think he was 22 at the time he made them and has, himself, said he believes his work and the start of his career in politics has demonstrated to him why those views are wrong.”
Mr Bradley said he had matured since posting the blog in 2012 and was sorry for the comments.
"I apologise for these posts. My time in politics has allowed me to mature and I now realise that this language is not appropriate," he said.