US Democratic presidential candidate Bernie Sanders has promised again to stay in the presidential race all the way to the Democratic Party’s convention in June.

In an interview with PBS NewsHour’s Judy Woodruff on Friday, Sanders insisted he still had a shot to win the Democratic nomination, despite Hillary Clinton’s lead in pledged delegates as well as so-called superdelegates.

“We have a narrow path to victory, but I’m going to fight to see that we can win,” Sanders said.

The US senator from Vermont needs roughly 1,000 delegates to clinch the nomination, while Clinton needs less than 200 to become the party’s nominee.

But Sanders pointed to upcoming primary elections in the states of West Virginia and Oregon, which have large numbers of white and working-class Democrats who overwhelmingly support Sanders.

“I think that we stand a good chance to win the primary in West Virginia,” Sanders said.

Sanders was leading Clinton 45-37 in the latest statewide poll in West Virginia, which holds its Democratic primary on Tuesday.

Sanders said he was confident he could win in Oregon as well and could compete in Kentucky and California, which has 546 delegates and holds its primary on June 7.

Clinton won in New York state on April 19 and several key victories in northeastern states at the end of April that seemed to speed her path toward the nomination.

But Sanders’ victory in Indiana earlier this week gave him fresh momentum and could lead to a string of victories later this month.

In the NewsHour interview, Sanders also defended his foreign policy experience, saying that his decision to vote against the Iraq War marked an important difference with Clinton, who supported the war in a vote that came back to haunt her in her 2008 presidential campaign and again this year.

“Iraq is and has been the most important foreign policy issue that this country has faced in our modern history,” Sanders said.

Sanders also seized on reports that the Clinton campaign was reaching out to donors who backed former Florida Gov. Jeb Bush, who dropped out of the GOP primaries in February after a string of poor performances in the early voting states.

“Are you really going to stand up to the working class and the middle class while you’re collecting millions from Jeb Bush supporters,” he said. “Those are the kinds of things that make not only my supporters, but ordinary Americans nervous.”