Twitter has also temporarily frozen its official @TeamTrump campaign account until the same clip is deleted.
The offending messages contained a Fox News video in which Mr. Trump made the statement in a telephone interview on Wednesday.
Facebook said it included “false claims that a group of people are immune to COVID-19, which is a violation of our policies on harmful COVID disinformation.”
“My opinion is that schools should be open,” Trump said during his appearance on Fox and Friends.
“If you look at children, children are almost – and I would almost certainly say – but almost immune to this disease. ”
He added that they “just don’t have a problem” and have “a much stronger immune system”.
Trump campaign spokeswoman Courtney Parella attacked social media companies and said the president was telling the truth.
“The president has stated a fact that children are less susceptible to the coronavirus,” a statement said.
“Another day, another demonstration of Silicon Valley’s blatant bias against this president, where the rules are only enforced one way. Social media companies are not the arbiter of truth. ”
While it is believed that children are less likely to be infected than adults and to suffer from milder symptoms, “virtually immune” is misleading.
The U.S. Centers for Disease Control and Prevention released a study in April of 2,500 children that found about one in five needed hospital treatment, compared to one in three adults.
:: Listen to Divided States on Apple Podcasts, Google Podcasts, Spotify and Spreaker
A global review of dozens of studies also indicated that the role of children in transmission was not clear but that “it seems likely that they do not play a significant role.”
“COVID-19 appears to affect children less often and with less severity, including frequent asymptomatic or subclinical infection,” concluded the study – produced in partnership with the Royal College of Pediatrics and Child Health.
Twitter had previously ruled that a tweet in March from Tesla boss Elon Musk – in which he said “kids are basically immune” to the virus – didn’t break its rules and left it in place.
Mr. Trump then reiterated his opinion at a White House briefing on Wednesday – but in slightly less robust terms.
“The kids handle it very well,” he told reporters.
“If you look at the numbers, in terms of mortality, death… for children under a certain age… their immune systems are very, very strong and very powerful.
“They seem to be able to handle it very well and that’s by all statistical claims. ”
Facebook said it had deleted a post from Donald Trump previously, but that this was the first time it had done so due to misinformation about the coronavirus in particular.
In March, the company removed its campaign ads for breaking rules for disinformation on a national census.
He also removed campaign ads in June that featured a red inverted triangle, a Nazi symbol to identify political prisoners, for violating his hate policy.