Tesla and SpaceX CEO Elon Musk said his companies will make ventilators if there is a shortage during a Twitter exchange Wednesday night about the coronavirus pandemic.

In a Twitter thread where Musk discussed the potential of a drug used to treat malaria as an option for coronavirus patients, a user who said he’s a Tesla owner asked Musk to repurpose factories to make ventilators.

“We will make ventilators if there is a shortage,” Musk responded.

We will make ventilators if there is a shortage — Elon Musk (@elonmusk) March 19, 2020

After Musk was told ventilator shortages are already occurring, he followed up asking about hospitals experiencing shortages.

Tesla makes cars with sophisticated hvac systems. SpaceX makes spacecraft with life support systems. Ventilators are not difficult, but cannot be produced instantly. Which hospitals have these shortages you speak of right now? — Elon Musk (@elonmusk) March 19, 2020

Health officials and experts have warned about the limited availability of ventilators, as hospitals are having trouble procuring enough of the machines to match the influx of new patients amid the coronavirus outbreak in the United States. The machines facilitate breathing for critically ill patients.

A lack of ventilators amid the COVID-19 outbreak is troubling, as the coronavirus is a respiratory illness that is thought to spread mainly through person-to-person contact.

Musk earlier this month dismissed the panic over the coronavirus. In a March 6 tweet, Musk simply tweeted “The coronavirus panic is dumb,” just five days before the World Health Organization declared the spread of COVID-19 a pandemic.

More than 9,400 cases have been confirmed in the U.S. with at least 150 deaths, according to Johns Hopkins University data.