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.

Kennedy appeared before the Senate Finance Committee on Wednesday as he seeks confirmation as the nation's health secretary.

Sen. John Fetterman (D., Pa.), who had said he was open to hearing out Robert F. Kennedy Jr., expressed more doubts about the Health and Human Services nominee after his first confirmation hearing Wednesday before the Senate Finance Committee.

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 confronted RFK Jr. on his vaccine stance during his confirmation hearing, calling out his former organization for selling anti-vaxx onesies.

Robert F. Kennedy Jr. was asked about anti-vaccine onesies sold by a nonprofit he formerly chaired, and recently resigned from, during his confirmation hearing Wednesday.

Senator Bernie Sanders (I-VT) demanded to know whether Robert F. Kennedy Jr. is "supportive" of onesies being sold by Children's Health Defense.

Sen. Bernie Sanders (I-Vt.) is drawing the ire of many on the left after the progressive politician voted to confirm Marco Rubio as Secretary of State. The unanimous vote, 99-0, handed President Donald Trump his first confirmed Cabinet member on the same day as his inauguration.

Sen. Bernie Sanders (I-Vt.) was one of many senators to question President Donald Trump’s pick for Health and Human Services Secretary, Robert F. Kennedy Jr., during a Senate confirmation hearing on Wednesday.

Sen. Bernie Sanders (I-Vt.) grilled Department of Health and Human Services nominee Robert F. Kennedy Jr. over a baby onesie sold from a group he founded that says, “No Vax, No Problem.” During

Vt., is rallying behind CBS News as its parent company reportedly mulls a settlement with President Trump following his $10 billion lawsuit.