The US Department of Veterans Affairs (VA) has treated 1,300 coronavirus patients with the malaria drug hydroxychloroquine, which a study has tied to an increased risk of death, according to a document released by a Senate Democrat on Friday. Senate Democratic Leader Chuck Schumer, who received the information from the VA in response to questions he submitted on the issue, said he was “deeply troubled” by the data. President Donald Trump has long urged use of hydroxychloroquine against coronavirus and recently said he has been taking it himself, despite evidence that the treatment could be harmful. A study published on Friday in the medical journal Lancet tied the drug to an increased risk of death in hospitalized patients with COVID-19, the disease caused by the novel coronavirus. In April, doctors at VA itself also said hydroxychloroquine did not help COVID-19 patients and might pose a higher risk of death.