Children's services are investigating Anthony Weiner after a lewd selfie he took of his erect manhood while lying in bed next to his four-year-old son and sent to a woman was revealed.

The Administration for Children's Services has launched a probe into the disgraced former Congressman, a city government source told the New York Post.

The agency's officials showed up at the apartment in Manhattan's Union Square that Weiner shared with his estranged wife Huma Abedin on Tuesday, the newspaper reports.

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Children's services are investigating Anthony Weiner (left, with estranged wife Huma Abedin) after a lewd selfie he took while lying in bed next to his four-year-old son was revealed

These kinds of visits are to ensure that a child has a room to sleep in and food, the source added.

But on Wednesday, Weiner said he had not been visited or interviewed by ACS.

In a statement to Daily Mail Online, a ACS spokesman said: 'In order to protect children and their privacy, ACS does not comment on specific cases or allegations of child maltreatment, regardless of whether or not allegations have been reported, are being investigated, or have not resulted in an investigation.'

It came after Bill Donohue, the president of the Catholic League, urged the New York State Office of Children and Family Services to investigate Weiner for sexually exploiting his young son.

In a letter sent to the agency, Donohue wrote: 'On August 29, we learned that Mr. Weiner took crotch shots of himself sporting an erection with his son lying next to him in bed.

'That was disturbing enough, but now we know that he used his child as a 'chick magnet' to allure sexual relationships.

'It would appear that Mr. Weiner's sexual exploitation of his child meets the definition of child sexual abuse as defined by the Administration for Children's Services. Please investigate this matter.'

Abedin, 41, announced on Monday that she is leaving the serially sexting ex-congressman after he was accused of sending raunchy photos and messages to yet another woman.

On Wednesday, Weiner (pictured with his son in 2013) said he had not been visited or interviewed by ACS

The disgraced former Congressman sent this lewd selfie that showed his erect manhood while he lay next to his son in bed

Abedin, who as vice chair of Clinton's campaign is destined for big things if the Democrat is elected president, stayed with Weiner after a sexting scandal led him to resign from Congress in 2011 and after a new outbreak of online misbehavior wrecked his bid for New York mayor in 2013.

She didn't leave even when a recent documentary blew up tense moments in their marriage to big-screen proportions.

But on Monday, she effectively declared she had had enough.

'After long and painful consideration and work on my marriage, I have made the decision to separate from my husband,' she said in a statement issued by the campaign.

'Anthony and I remain devoted to doing what is best for our son, who is the light of our life.'

The New York Post published photos late on Sunday that it said Weiner had sent last year to a woman identified only as a '40-something divorcee' who lives in the West and supports Republican Donald Trump.

The photos included two close-ups of Weiner's bulging underpants.

Weiner (above) also sickeningly boasted about using his son as a 'chick magnet' when he sexted a mystery brunette

In one of the pictures, Weiner is lying on a bed with his toddler son while texting the woman, according to the Post.

The tabloid also ran sexually suggestive messages that it said the two exchanged.

Weiner told the Post that he and the woman 'have been friends for some time.'

'She has asked me not to comment except to say that our conversations were private, often included pictures of her nieces and nephews and my son and were always appropriate,' the 51-year-old Democrat told the newspaper.

The Post didn't say how it obtained the photographs and messages.

Abedin is a longtime Clinton aide and confidante who is often referred to as the candidate's second daughter.

Trump immediately seized on the aide's marital split to accuse Clinton of 'bad judgment.'

The New York Post published photos late on Sunday that it said Weiner had sent to a woman identified only as a '40-something divorcee.' Above, Abedin leaves a fundraiser on Sunday

He suggested that Weiner might have compromised national security, but offered no evidence to support the allegation.

'I only worry for the country in that Hillary Clinton was careless and negligent in allowing Weiner to have such close proximity to highly classified information,' Trump said in a statement. 'Who knows what he learned and who he told?'

Abedin has been under scrutiny during the probe into Clinton's use of a private email server while she was secretary of state.

Federal prosecutors declined to file charges in the investigation, but FBI Director James Comey said Clinton and her aides had been 'extremely careless' in their handling of classified information.

Abedin began working for the former first lady as a White House intern and became a trusted aide as Clinton won a seat in the Senate representing New York in 2000, ran for president in 2008 and served as President Barack Obama's secretary of state.

Former President Bill Clinton officiated when Abedin and Weiner married in 2010.

The marriage would provide years of fodder for political commentators, armchair psychologists and spouses all over America who wondered: How could she stay with him?

Abedin (above, with Weiner in 2013) was all in for her husband's mayoral bid - then a new series of sexually explicit pictures and messages emerged

Abedin was pregnant with the couple's son, Jordan, when a photo of a man's bulging underpants appeared on Weiner's Twitter account in 2011.

After initially claiming his account was hacked, Weiner acknowledged inappropriate online communication with several women.

Two years later, Abedin was all in for her husband's mayoral bid, raising money, appearing on the campaign trail and participating in interviews in which the couple talked about rebuilding their trust and marriage.

Then a new series of sexually explicit pictures and messages emerged, and Weiner was forced to acknowledge he kept sexting after he had resigned from Congress.

Still, Abedin said, 'I love him, I have forgiven him, I believe in him, and... we are moving forward.'

Voters weren't ready to forgive, however. Weiner lost the Democratic primary.

Weiner has since remained in the public eye, commenting on politics on cable news shows.

'Weiner,' the documentary offering a cringe-inducing inside view of his mayoral campaign and its unraveling, played in theaters earlier this year and is set to air on Showtime this fall.

He recently refused to answer when asked whether he was still sexting, telling The New York Times Magazine in an interview published August 16: 'I'm not going to go down the path of talking about any of that.'