"You're supposed to keep us safe. And you need to know the answers to these questions," Kennedy said while grilling Wolf on Tuesday.
"How far away are we from getting a vaccine?" Kennedy asked. "Several months," replied Wolf. "Well that's not what we just heard testimony about," Kennedy said.
Separately, U.S. Health and Human Services (HHS) Secretary Alex Azar told a Senate subcommittee there will likely be more cases in the United States, and he asked lawmakers to approve $2.5 billion in funding to fight the outbreak after proposing cuts to the department's budget.