Former Trump adviser Elon Musk condemned allegations that he used drugs extensively last year. The New York Times published a report on Friday claiming that Musk took ketamine so frequently that it affected his bladder.

Elon Musk interrupted a reporter who started to ask about a New York Times story alleging he used a copious amount of drugs and travelled with a pill box that appeared to contain Adderall last year as he ramped up his donations to President Donald Trump—blasting the paper, but stopping short of denying the report.

SpaceX's federal contracts require those with security clearances, like Musk, to remain drug-free and submit to random drug tests. The NYT says Musk gets advance notice of these tests.