On Monday, Rep. Alexandra Ocasio-Cortez was one of a group of lawmakers who visited a Customs and Border Protection migrant detention facilities near El Paso, Texas.

She said in a tweet that migrants were being held in appalling conditions and "drinking out of toilets."

Critics accused her of misrepresenting the situation. CBP said migrants were using toilet units with built-in drinking fountains for clean drinking water.

Ocasio-Cortez hit back, saying that, on the visit, they found the fountains weren't working, and "women were told they could drink out of the bowl."

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After New York Rep. Alexandra Ocasio-Cortez visited a US Customs and Border Protection (CBP) detention facility for migrants in El Paso, Texas, on Monday, she described shocking conditions and said officials were using "psychological warfare" against detainees.

The most alarming claim was that migrants were made to drink from toilets.

"Now I've seen the inside of these facilities. It's not just the kids. It's everyone," she wrote on Twitter.

"People drinking out of toilets, officers laughing in front of members Congress. I brought it up to their superiors. They said 'officers are under stress & act out sometimes.' No accountability," she added.

Her claims were disputed by CBP.

Rep. Alexandria Ocasio-Cortez on a tour of Border Patrol facilities and migrant detention centers on July 1 in El Paso, Texas. Photo credit should read LUKE MONTAVON/AFP/Getty Images

An official told the New York Post that migrants are not drinking out of toilet bowls.

Instead, the official said, the facility has prison-style toilets where drinking water is dispensed from a fountain attached to the toilet as part of a single unit.

"'No one is drinking toilet water," an official said. "They're drinking potable water from the sink attached to the toilet."

Aaron Reichlin-Melnick, an immigration lawyer and policy analyst at the American Immigration Council, tweeted pictures of the toilet-drinking-fountain combos taken from court filings and other inspections of detention facilities.

The photo shows one of the units from a 2016 Arizona court filing.

Other pictures showed filthy conditions in toilets and out-of-order drinking fountains.

Ocasio-Cortez's description of the facilities echoes claims made in court documents filed on Monday by migrants detained in CBP facilities.

"They would tell us to drink from the sink above the toilet," said a migrant named as Cristobal, who was detained with his 7-year-old son in June near El Paso. "We did not get any clean water the entire time."

Seizing on the pictures, though, critics accused Ocasio-Cortez of misrepresenting the situation. David Martosko, the US politics editor for DailyMail.com, was among them.

"I haven't seen photo of the Clint, TX facilities that @AOC described today, but it would be interesting if 'drinking from the toilet' meant drinking from an attached sink marked 'potable water,'" he tweeted, along with the 2016 photo.

In response, Ocasio-Cortez said the photo did show the type of hybrid unit she saw in Texas.

However, she said that in the facility she visited, the drinking part was broken, and the migrants had been told to drink from the toilet itself.

She said: "This was in fact the type of toilet we saw in the cell. Except there was just one, and the sink portion was not functioning - @AyannaPressley smartly tried to open the faucet, and nothing came out. So the women were told they could drink out of the bowl."

Business Insider has contacted Massachusetts Rep. Ayanna Pressley for comment on Ocasio-Cortez's claims. On Monday night, she shared Ocasio-Cortez's tweet.

CBP did not immediately respond to a request for comment on Ocasio-Cortez's new claim.