A clash between Bernie Sanders and Robert F. Kennedy Jr. at his confirmation hearing for Secretary of Health and Human Services took an unexpected turn on Wednesday when the senator defined a "onesie" in a line of questioning about Kennedy Jr.

Sen. Bernie Sanders (I., Vt.), thought to be a possible “yes” vote on Robert F. Kennedy Jr. because they have some shared views on food safety and obesity, grilled Kennedy on his views on abortion and vaccines.

Bernie Sanders (I-Vt.) was unconvinced. He demanded Kennedy address some of the merchandise sold by Children’s Health Defense, the anti-vaccine organization Kennedy started. “On their website, they are selling what’s called onesies ― these little things,