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The prominent anti-Trump Lincoln Project has disavowed its co-founder John Weaver after several men accused him of sending them overtly sexual and unsolicited messages.

At least one man was underage when Mr Weaver allegedly first made contact.

In a statement, the Republican group labelled the 61-year-old "a predator, a liar and an abuser".

Without admitting specifics, Mr Weaver apologised for the pain he caused by "living a deeply closeted life".

Mr Weaver worked on four Republican presidential campaigns before creating the Lincoln Project with other "never Trump" Republicans. He is often considered to be one of the late Senator John McCain's closest aides.

He is married to a woman - his second wife - and the couple has two kids.

After the online magazine The American Conservative reported allegations last month, he admitted his actions to US media outlet Axios.

"The truth is that I'm gay. And that I have a wife and two kids who I love. My inability to reconcile those two truths has led to this agonising place," Mr Weaver told the publication.

Mr Weaver has been accused by several young men working in politics of aggressive and unwanted online behaviour.

In the most explicit messages, he offered professional and personal assistance to the men in exchange for sex, according to an investigation by The New York Times.

The investigation included interviews with 21 accusers and looked into their text exchanges with Mr Weaver. It did not reveal any unlawful conduct.

In addition, none of the messages led to physical encounters, except in one consensual case.

However, several men described Mr Weaver's repeated and uninvited advances as exploitative, often fearing they would lose out on professional opportunities if they did not engage with him.

On Sunday, the Lincoln Project assailed him for "his deplorable and predatory behaviour".

"John Weaver led a secret life that was built on a foundation of deception at every level," the statement said.

"We extend our deepest sympathies to those who were targeted by his deplorable and predatory behaviour. We are disgusted and outraged that someone in a position of power and trust would use it for these means."

The Lincoln Project was a mainstay of the 2020 presidential campaign with ads taunting Donald Trump and his allies, many of which went viral and even earned the then-president's ire on Twitter.

The group gained an elevated profile in part because of long-time strategists like Mr Weaver who lent legitimacy to a Republican "old guard" fighting back against the Trump-led wing of the party.

The statement added: "The totality of his deceptions are beyond anything any of us could have imagined and we are absolutely shocked and sickened by it. Like so many, we have been betrayed and deceived by John Weaver."

In an appearance on national television, its co-founder George Conway expressed shock: "It's terrible and awful and appalling and unfathomable, I, I didn't know John very well. I frankly only spoke to him a couple of times on the phone early on in the Lincoln Project. It's almost, I don't even know what to say. It's just terrible. It leaves me speechless, frankly."

Online critics claim the Lincoln Project hid their knowledge of Mr Weaver's behaviours, and did not acknowledge earlier reporting on the subject.

Mr Weaver has not refuted the allegations and reiterated his apology to the men in a new statement to The New York Times.

"I am so disheartened and sad that I may have brought discomfort to anyone in what I thought at the time were mutually consensual discussions," he said.

"In living a deeply closeted life, I allowed my pain to cause pain for others. For that I am truly sorry to these men and everyone and for letting so many people down."