Sen. Elizabeth Warren joined a chorus of voices Thursday casting doubt on the thoroughness of the FBI's investigation into sexual misconduct allegations against Supreme Court nominee Brett Kavanaugh. The White House released a supplemental FBI background check on Kavanaugh to the Senate this morning, but critics say the FBI failed to talk to key figures, including Kavanaugh's first accuser, Dr. Christine Blasey Ford, Kavanaugh himself, as well as Kavanaugh's third accuser, Julie Swetnick.

"The whole point of doing the investigation was to determine if there is corroboration. It seems to me that starts both by interviewing the two people involved, Mr. Kavanaugh and Dr. Ford, so you get as much detail as you can about the event and everything around it, and then looking for as much corroborating or contradictory evidence as possible. That means interviewing anyone who might have information that would either support or deny," Warren told Boston Public Radio Thursday.

"Without that, we just really haven't had an investigation," she added.

Warren has not yet viewed the report personally but told Boston Public Radio that she is scheduled to do so this afternoon.

Sen. Dianne Feinstein, the ranking member on the Senate Judiciary Committee, told reporters this morning that the report "looked to be the product of an incomplete investigation." However,key Republicans have indicatedthat they are satisfied with the scope of the report, including Sen. Susan Collins of Maine, who said the investigation appeared to be "very thorough."

Senate Majority Leader Mitch McConnell says he expects to bring a vote ending the debate as early as Friday morning. The vote on Kavanaugh's confirmation could occur as soon as this weekend.

Warren has said that the Kavanaugh confirmation process influenced her decision to open the doors to a 2020 presidential run. At a town hall in Holyoke over the weekend, Warren hinted for the first time that such a presidential run may be in her future.

Warren echoed the sentiment on BPR, saying, "I'm going to keep serving the people of Massachusetts in exactly the way I promised. I hope people will elect me in 2018. I'm in this race. But yeah, I'm going to take a hard look afterwards."

Though her name is frequently floated as a Democratic challenger to President Donald Trump in 2020, Warren had previously maintained that she was focusing on keeping her Senate seat.

She is being challenged by State Rep. Geoff Diehl, who was the co-chair of the 2016 Trump campaign in Massachusetts, and independent candidate Shiva Ayyadurai, an entrepreneur.