Disgraced peer Lord Archer has said he has no interest in returning to front line politics.
But in his first TV interview since being jailed for perjury, he told the BBC he could return to the Lords if there was a debate on prison reform.
The former Conservative deputy chairman also confirmed he had rejoined two local party associations.
Tory leader David Cameron said last year Lord Archer would not receive the party whip if he returned to politics.
Lord Archer admitted it was "very unlikely" he would return to the House of Lords.
But if he saw something he knew "wasn't right" in a debate on prison reform, he said he would want to take part.
"I would want to go back and speak about it, and I would want to vote on it."
He said he would be concentrating on writing rather than politics.
"I'm not taking any interest in politics. I'm not involved in politics in any way. My life is in writing now," he said.
Lord Archer has raised millions of pounds for the Conservatives and stood as the party's candidate for the high profile job as London mayor.
But he was forced to withdraw from the race in 2000 when it emerged he had lied in his 1986 High Court libel trial against the Daily Star, when he won £500,000 in damages.
He was jailed for perjury in 2001 and served two years of a four year sentence.