Elizabeth Warren's son went to a pricey Texas private school - despite the Democratic presidential candidate's claims her children only received public education, according to reports.

In a clip taken Thursday, Warren, 70, told one Atlanta mother who suggested the Massachusetts senator's children went to private school: 'My children went to public schools.'

But a yearbook picture from 1986-1987 obtained by The Washington Free Beacon appears to show Warren's son Alex attended Kirby Hall School in Texas where fees now stand at more than $17,000 a year, according to The New York Post. Figures show it cost $4,700 in 1995, the earliest date on record.

And in a statement Warren's aide appeared to walk back on the Democrat's earlier claims, telling Fox News: 'Elizabeth's daughter went to public school. Her son went to public school until 5th grade.'

Warren, 70, told one Atlanta mother who suggested the Massachusetts senator's children went to private school: 'My children went to public schools.' Their exchange is pictured

A yearbook picture from 1986-1987 and obtained by The Washington Free Beacon appears to show Alex attended Kirby Hall School in Texas where fees now stand at $17,000 a year

The aide added: 'Elizabeth wants every kid to get a great education regardless of where they live, which is why her plan makes a historic investment in our public schools.

'Every public school should be a great school. Her plan does not affect funding for existing non-profit charter schools, but she believes we should not put public dollars behind a further expansion of charters until they are subject to the same accountability requirements as public schools.'

DailyMail.com has contacted a representative of Warren for comment.

In the footage from Thursday Sarah Carpenter, of the Powerful Parent Network, said: 'We are going to have the same choice that you had for your kids because I read that your children went to private schools.'

Mother-of-two Warren, a front-runner for the Democratic Party's 2020 presidential nomination, replies: 'My children went to public schools.'

But her son Alex appears to have gone to a fee paying school for at least a year, during Warren's time as a professor at the nearby University of Texas at Austin.

Warren said Thursday she would impose transparency requirements on privately operated public charter schools and end federal funding for the creation of new charter schools, saying the Federal Charter School Program is an 'abject failure,' with many schools under investigation by regulators.

She said she would ban for-profit charter schools outright and direct the Internal Revenue Service to investigate nonprofit charters that are run by for-profit entities or operate with the assistance of for-profit service providers.

Mother-of-two Warren is a front-runner for the Democrat's 2020 presidential nomination

Alexander Warren laughs while listening to his mother speak. In a statement Warren's aide said: 'Elizabeth's daughter went to public school. Her son went to public school until 5th grade'

Warren has previously been forced to stand by her account of being fired from a teaching job nearly 50 years ago because she was pregnant - an anecdote that she routinely recounts at campaign events.

In a campaign speech she repeats at town halls, the Massachusetts senator tells of graduating from the University of Houston and being hired by the Riverdale Board of Education in New Jersey as a speech pathologist during the 1970-71 school year.

She says she had planned to continue teaching but got pregnant and, once she began showing 'the principal did what principals do: Wished me luck, showed me the door and hired someone else for the job'.

But in October Fox News reported on a video of a 2007 interview Warren gave at the University of California at Berkeley where she offered a different account of leaving teaching — suggesting it was by choice.

'I worked with the children with disabilities. I did that for a year, and then that summer, I actually didn't have the education courses, so I was on an 'emergency certificate,' she says in it.

'I went back to graduate school and took a couple of courses in education and said, 'I don't think this is going to work out for me.' I was pregnant with my first baby, so I had a baby and stayed home for a couple of years, and I was really casting about, thinking, 'What am I going to do?'

Warren, left, stands with her family, including her daughter, Amelia Warren Tyagi, in June

Senator Elizabeth Warren waves to supporters as she walks with grandson Atticus Tyagi, dog Bailey and other family members to vote in November last year

But Warren stood by her story, tweeting: 'When I was 22 and finishing my first year of teaching, I had an experience millions of women will recognize. By June I was visibly pregnant — and the principal told me the job I'd already been promised for the next year would go to someone else.'

She added via tweet: 'This was 1971, years before Congress outlawed pregnancy discrimination — but we know it still happens in subtle and not-so-subtle ways.'

Warren critics have seized on the issue, noting that it — like with the outcry Warren faced for taking a DNA test last year to try to prove her past claims of Native American heritage — shows she's willing to exaggerate her personal story.

The test revealed she had 1/1,024 Native American DNA.