US President Joe Biden urged Morehouse College graduates not to give up on democracy in a somber commencement address on Sunday, acknowledging their anger over the onslaught in Gaza while warning about risk to American freedoms, Reuters reports.

Biden said he shared graduates’ concerns over the humanitarian situation in the Gaza Strip and was continuing to push for a deal to pause the conflict in exchange for the release of hostages. He said leadership can be “hard and lonely” and said frustration and anger about the conflict permeated his own family.

“This is one of the hardest, most complicated problems in the world. I know it angers and frustrates many of you,” he told the crowd. “It’s a humanitarian crisis in Gaza, that’s why I’ve called for an immediate ceasefire,” Biden said to applause.

A generational divide was apparent at the decorous commencement, as older alumni at times stood and cheered the president while current graduates sat in silence or offered polite applause.

Some students wore keffiyehs — the black-and-white head scarf that has become an emblem of solidarity with the Palestinian cause — around their gowns. A handful of students turned their backs to Biden in silent protest. Morehouse’s valedictorian also called for a permanent and immediate ceasefire, garnering Biden’s applause.

“It’s natural to wonder: Does the democracy you hear about actually work for you?” he said. Even so, he added, Americans must continue “to call out the poison of white supremacy, root out systemic racism. Democracy is still the way.”

Biden is selling his vision to jaded voters who back his policies but are not sold on the 81-year-old candidate himself, including younger Black men, as he faces a rematch against former president Trump, who has used increasingly authoritarian language and already stoked doubts about the election’s legitimacy.