Media playback is unsupported on your device Media caption Duncan Smith: Tories "looking like chaos"

Iain Duncan Smith has said the Conservative leadership contest rules should be changed to avoid "chaos".

Eleven MPs have declared that they will run to replace Theresa May, with the number expected to rise.

Mr Duncan Smith, who led the Tories from 2001 to 2003, told the BBC the number of MPs needed to nominate a candidate should be increased.

But Charles Walker, co-chairman of the committee which sets the rules, played down the prospect of any change.

He told the BBC: "This is a leadership contest. We're not going to artificially limit the number of candidates who can stand."

And former chancellor George Osborne said choice was "not a bad thing", although contenders had to be scrutinised.

"I don't think there's a problem there's so many candidates," he told BBC Radio 4's PM programme.

The leadership contest gets fully under way on 7 June, when Mrs May stands down as Conservative leader.

Who will replace Theresa May?

The winner of the contest to lead the Conservative Party will become the next prime minister.

MPs will hold a series of votes, during which the field will be whittled down one by one each time. When two candidates are left, they will go to a full vote of the Conservative Party membership.

Mr Duncan Smith, who ran against four other candidates when he was elected Tory leader under the same rules, said: "I have never seen so many people lining up and there may be more."

"We need to present a face of a party that actually can get jobs done," he said. "We don't want to have this meandering around looking like chaos."

At the moment, only two MPs need to nominate a candidate for them to stand. Mr Duncan Smith said that threshold should rise to "10, maybe 12".

And he suggested that two or three candidates should be removed in each round of the ballots held by Tory MPs, in order to "accelerate the process".

The executive of the 1922 committee of backbench Conservative MPs - which sets the contest rules - is expected to meet next week to discuss the issue.

Image caption Theresa May said the UK was a "land of opportunity" when asked if too many candidates were standing

The winner is expected to be announced in late July.

Mr Duncan Smith said only those with significant political experience should put their names forward.

"We have to be very focused that the person who wins this will, the day after, be the prime minister and have to pick up the pieces of Brexit and all the other elements," he said.

What the candidates are saying

Meanwhile, Tory leadership hopeful Esther McVey told Sky News that parents should be able to take their children out of LGBT education in primary school.

Asked about the row over the issue in Birmingham, she told Sky News that people "shouldn't be protesting outside primary schools". But she said: "I believe parents know best for their children ... really the parents need to have the final say in what they want their children to know."

Fellow Tory MP Justine Greening responded on Twitter: "You can't pick & choose on human rights and equality. Children should understand a modern and diverse Britain they're growing up in."

Elsewhere, Chancellor Philip Hammond said he would not "feel the need" to join the list of candidates if his views were "properly represented".

And International Development Secretary Rory Stewart, who is running for the leadership, apologised for smoking opium - a class A drug in the UK - at a wedding in Iran 15 years ago.

His admission came days after Foreign Secretary Jeremy Hunt - another candidate - told the Times he had drunk a cannabis lassi while backpacking through India.

When asked at a press conference in London whether too many people were running to replace her, Mrs May said the UK was a "land of opportunity".

The declared candidates are:

Brexit minister James Cleverly

Environment Secretary Michael Gove

Health Secretary Matt Hancock

Foreign Secretary Jeremy Hunt

Home Secretary Sajid Javid

Former Foreign Secretary Boris Johnson

Former Leader of the House of Commons Andrea Leadsom

Housing minister Kit Malthouse

Former Work and Pensions Secretary Esther McVey

Former Brexit Secretary Dominic Raab