The editor in chief of the Sunday Mirror has said the paper "stands by" its sex-scandal story about Tory MP Brooks Newmark.
Lloyd Embley said there was a "clear public interest" in the story because of Mr Newmark's role as a minister and founder of the Women2Win group aimed at prospective female parliamentary candidates.
He pointed out that the investigation was carried out by a freelance journalist before the Sunday Mirror was involved.
However he apologised to the models whose images were used by the journalist, who was posing as a young female Tory activist.
"We thought that pictures used by the investigation were posed by models but we now know that some real pictures were used," Mr Embley said.
"At no point has the Sunday Mirror published any of these images but we would like to apologise to the women involved for their use in the investigation."
There's been continued fallout following the resignation of Braintree MP Brooks Newmark from his ministerial post.Read the full story ›
The Prime Minister has told ITV News Anglia he was "a bit shocked" about the revelations about Braintree MP Brooks Newmark in a Sunday newspaper.
Speaking to ITV Anglia's Political Correspondent Emma Hutchinson, Mr Cameron said: "Obviously he made the right decision, he had to go. He needs to rebuild his relations with his family."
Brooks Newmark resigned as a Cabinet Office minister at the weekend. Asked if Mr Newmark should resign as an MP, the Prime Minister said that was between him and his constituents.
"I don't get too shocked by these things but I was a bit shocked. Obviously he made the right decision he had to go. He needs to rebuild his relations with his family. I'm sure he'll be working very hard on that. But life has to go on in the government.
"He's taken he decision as a minister, his future as a MP is between him and his constituents. He's a hard working MP. He's done a lot of good for his constituents and I hope he can carry on."
The Essex MP in the neighbouring constituency to Brooks Newmark says he was right to resign as a minister.
Priti Patel, the Conservative MP for Witham, said it was a personal matter for Mr Newmark, who represents Braintree.
"That's a very personal matter for Brooks and his family. He's made it quite clear that what he did was wrong. Difficult personal circumstances for him but I think he did the right thing in resigning from the government."
A Conservative MP says he will complain to the newly-formed press regulator over the "entrapment" that led to his colleague's resignation as a government minister.
Brooks Newmark resigned as Minister for Civil Society after Sunday Mirror revelations that he had exchanged suggestive pictures with a reporter posing as a young Tory campaigner.
Following the story's publication, fellow MP Mark Pritchard said he would be referring the newspaper to the Independent Press Standards Organisation (Ipso).
"It is in the public interest that their actions are fully investigated. This is the first real test as to whether the new body, Ipso, has any teeth."
Tory MP Brooks Newmark told ITV News he had "no one to blame but himself" over the explicit photo scandal that led to his resignation.
Mr Newmark has resigned from the Government after the Sunday Mirror published allegations he shared explicit sexual images of himself with an undercover female reporter on social media.
Essex MP Brooks Newmark has resigned as a Cabinet Office minister after he was notified a story was to be published in a Sunday newspaper.Read the full story ›
David Cameron has been hit by the shock ministerial resignation of an Essex MP on the eve of the Conservative Party conference.
The Braintree MP, Brooks Newmark, said that he was quitting as Cabinet Office minister with responsibility for civil society.
"I have decided to resign as Minister for Civil Society having been notified of a story to be published in a Sunday newspaper. I would like to appeal for the privacy of my family to be respected at this time. I remain a loyal supporter of this Government as its long term economic plan continues to deliver for the British people."
A Downing Street spokesman said: "The Prime Minister has accepted Brooks Newmark's resignation from his role as Minister for Civil Society."
The announcement came just hours after Conservative backbencher Mark Reckless announced that he was defecting to UKIP.
A 19-year-old student from Essex took his own life because he struggled to deal with a sexual assault he suffered as a child.Read the full story ›
Fire crews have been tackling a blaze in an outbuilding on farmland just off Hollies Road at Bradwell near Braintree which started at 1.15am today.
The A120 was closed between the Marks Farm roundabout and Coggeshall as firefighters had to access fire hydrants on the road. It was reopened shortly before 6.30am. Hollies Road remains closed.
Police are liaising with the Fire Service about the cause of the fire but are not currently investigating.