Another said she had "resigned for personal reasons".
The current controversy centers on Warren's teaching job at a public school district in Riverdale, N.J., in the early 1970s.
A Washington Free Beacon story published Monday also raised questions about Warren's story. School board minutes, unearthed by The Washington Free Beacon, a conservative website, say her contract was renewed in April 1971; two months later, board minutes say her resignation was "accepted with regret".
So, the school board had formally offered to renew Warren's teaching job.
The CBS report also noted that stories from the local Paterson News reported that Warren had left her role "to raise a family".
Warren has been able to raise millions of dollars so far, despite eschewing pricey fundraisers, where wealthy donors who give thousands of dollars have the chance to meet candidates. As the Free Beacon noted, Warren's first book, published the year after she became a USA senator, includes her current claim that she was sacked for being pregnant.
"I was married at 19 and then graduated from college, actually, after I'd married", Warren said in an interview on a show produced by the University of California, Berkeley.
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In a campaign speech she repeats at town halls while crisscrossing the country, the MA senator tells of graduating from the University of Houston and being hired by the Riverdale Board of Education in Morris County as a speech pathologist during the 1970-71 school year.
The Massachusetts senator has ridden a steady rise in the polls to emerge as among the leading 2020 contenders as the first election-year contest in February nears. "I did that for a year, and then that summer I didn't have the education courses, so I was on an 'emergency certificate, ' it was called", Warren said in 2007. Warren understands that she will need a committed and energized base of support. Fox News has cited the 2007 interview as a contradiction with her more recent statements.
She said she ultimately made a decision to stay home and take care of her firstborn. I had 4- to 6-year-olds. "We have children, we'll have more children, you'll love this.' And I was very restless about 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".
"This was 1971, years before Congress outlawed pregnancy discrimination - but we know it still happens in subtle and not-so-subtle ways", she said. "The principal said they were going to hire someone else for my job".
However, that story is drastically different from the one she now sells voters in which she claims that, "I was visibly pregnant, and the principal did what principals did in those days".
PolitiFact has been attempting to identify and contact the principal and will update this story if we do. I'm glad, however, that Warren is holding fast to her story and that she's encouraging others to share their stories as well. She added that being elected to the Senate in 2012 caused her to "open up" more about her past, revealing new details.
Her campaign reported raising $24.6 million in the third quarter of 2019, slightly behind the $25.3 million raised by U.S. Senator Bernie Sanders, the only other Democrat of the 19 running to swear off traditional fundraisers.