The Pennsylvania senator has drawn criticism from members of his own party over his alignment with Republicans on certain issues.

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.

Among Pennsylvania voters, 48% approve and 37% disapprove of John Fetterman's performance as U.S. senator, according to a recent analysis by Morning Consult.

On this morning’s episode of The View, Fetterman — a Democrat who recently met with Trump at Mar-a-Lago — clarified how he felt about former president Joe Biden pardoning his son before leaving office, as well as Trump’s blanket pardon for more than 1,500 people charged in connection to the Jan. 6 insurrection.

While the presidential inauguration was moved inside Monday due to the bitter cold outside, Sen. John Fetterman (D-Pa.) didn’t let the cold bother him. Fetterman arrived to the U.S. Capitol for the swearing-in ceremony in a pair of grey shorts,

HARRISBURG — When Democrat John Fetterman got elected to Pennsylvania’s U.S. Senate seat, many backers hoped he’d challenge convention and the status quo. He did and has — just not in the way many had expected. Fetterman has broken with his party ...

ABC News spoke with Pennsylvania Sen. John Fetterman, a Democrat, on Tuesday to discuss Jan. 6 pardons, the Laken Riley Act, and his meeting with Trump at Mar-a-Lago. [ The senator, to better hear the conversation, used his phone to caption the questions he was asked.]

While attending Donald Trump's inauguration, Fetterman said switching from a Democrat to a Republican would be a "rocket sled to Palookaville."

Trump says he’ll send the ‘worst’ criminal migrants to Guantanamo. Guantanamo Bay detention center was used to house those who the U.S. suspected as terrorists.

The health committee chairman, Sen. Bill Cassidy, R-La., also has expressed concerns about Kennedy's anti-vaccine work. A physician, Cassidy said earlier this month he “had a frank conversation” and “spoke about vaccines at length” with Kennedy. On Tuesday, Cassidy told reporters that he is still unsure if he is backing Trump’s nominee.

The longtime liberal faces deep skepticism over his public health views. “Frankly, you frighten people,” one Democratic senator told his former roommate.