After an hour-long meeting with President Barack Obama in the White House, Vermont senator Bernie Sanders, who trails Hillary Clinton by more than 3 million votes, defiantly told the press that he would do “everything in my power” to defeat Donald Trump. Everything, that is, except drop out of the race.

“Donald Trump would clearly to my mind and I think the majority of Americans be a disaster as president of the United States,” he told reporters shortly after the meeting, saying that it was “unbelievable” that the G.O.P. had nominated a candidate who “makes bigotry and discrimination the cornerstone of his campaign . . . Needless to say, I am going to do everything in my power and I will work as hard as I can to make sure that Donald Trump does not become president of the United States.”

Those things include meeting with Clinton, whom he congratulated for running a “strong campaign” and who defeated him in several primaries on Tuesday, including California. They do not, apparently, include conceding the Democratic primary race, which Sanders has already lost by more than 900 delegates. Undeterred, and still hoping to sway Clinton’s superdelegates to his side at the Democratic convention, he swore to soldier on. “I will of course, be coming in the D.C. primary, which will be held next Tuesday,” he said.

In an appeal to next week’s voters, Sanders said that he was in favor of granting D.C. statehood. (Clinton is also in favor of D.C. statehood. To further lock in Sanders’ reputation as a sore loser, he added that he looked forward to seeing the final voter tally in California. (Days beforehand, the A.P. declared Clinton the winner of the California primary, which she won by nearly 13 points.)

Shortly after the meeting, Obama endorsed Clinton.

When asked his thoughts about the endorsement during a photo opp with Minority Leader Harry Reid, Sanders sat in stony silence, according to The Hill.