Presumptive Democratic presidential nominee Joe Biden on Wednesday slammed Trump’s retweet of a Cameroonian-American physician promoting anti-malaria drug hydroxychloroquine as a treatment for COVID-19, and referred to her as a “crazy woman.” Biden made the statements during a virtual event with the UnidosUS Action Fund, a non-profit organization advocating for Latino political power.

“Stop tweeting and start doing something about it, damn it," Biden said when asked about Trump’s push to reopen schools amid the pandemic. “Stop talking about this crazy woman he talked about last night who's an absolute disgrace.”

Trump retweeted Houston-based Dr. Stella Immanuel on Tuesday, with the video later removed by the social media platform. Trump said he was "very impressed" with Immanuel during a White House press conference, saying she was an “important voice.” 

"She said that she had tremendous success with hundreds of different patients, I thought her voice was an important voice but I know nothing about her," Trump said. 

The Twitter video shows Immanuel on the steps of the Supreme Court with other physicians in lab coats, calling themselves America's Frontline Doctors.

"Nobody needs to get sick. This virus has a cure - it is called hydroxychloroquine, I have treated over 350 patients and not had one death," Immanuel said in the video.

She claimed that hydroxychloroquine was widely taken in her home country of Cameroon. 

Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases and a member of Trump’s coronavirus task force, criticized the video during an interview Wednesday with MSNBC host Andrea Mitchell. Fauci described the video as "a bunch of people spouting something that isn't true," and said, "the only recourse you have is to be very, very clear in presenting the scientific data that essentially contradicts that."

"The scientific data, the cumulative data on trials, clinical trials that were valid — namely, clinical trials that were randomized and controlled in the proper way — all of those trials show consistently that hydroxychloroquine is not effective in the treatment of coronavirus disease or COVID-19," Fauci said. 

Although Immanuel has a valid physician’s license, according to the Texas Medical Board, she has frequently promoted numerous medical conspiracies. Immanuel is also a pastor and the founder of Fire Power Ministries, a religious organization in Texas.

In one 2015 sermon, Immanuel alleged that doctors are using vaccines to stop people from being religious. She has also claimed that space alien DNA is being used in medical treatments and said the U.S. government is partly run by “reptilians” and other extraterrestrials.