Vermont Sen. Bernie Sanders acknowledged Wednesday that "it doesn't appear" he will be the Democratic presidential nominee.

Sanders made the comments during a taped C-SPAN interview, in which he didn't address the state of his campaign, but said he did expect to speak at the Democratic National Convention in Philadelphia. 

“It doesn’t appear that I’m going to be the nominee, so I’m not going to be determining the scope of the convention," he said. 

Sanders' presidential campaign said Wednesday afternoon he will hold a press conference Thursday in New York City to address "where we go from here."

The Vermont senator has not yet formally left the presidential race or endorsed presumptive nominee Hillary Clinton. 

He also did not answer a question in the C-SPAN interview on whether he'll endorse Clinton, but said there's no agreement in place for him to endorse before he's given a convention speaking slot.

“It would be nice to speak at the Democratic National Convention,” he told C-SPAN. “If they don’t want me to speak, so what? I expect that I will speak.”

Sanders also urged Clinton to pick a running mate whom he considers to be liberal.

“Our job now is to have her listen to what millions of people in this country who supported me want to see happen,” he said, adding that it would be a "terrible mistake for her to go to a candidate who has roots in Wall Street or has been backed by Wall Street."

Democrats, including House Democratic Leader Nancy Pelosi of California and Rep. James E. Clyburn of South Carolina nudged Sanders earlier on Wednesday to endorse Clinton.

Pelosi told reporters she hopes a Sanders endorsement comes before the convention endorses Hillary Clinton before the national convention in July, and that the Vermont senator "knows what's at stake" in November. "Two words: Donald Trump," she said.

The Associated Press contributed to this report.