During a walk-through at the United Center ahead of his speech tonight, President Joe Biden said he was ready to pass the torch.

"Are you ready to pass the torch, sir?" a reporter asked from the floor while Biden did his stage check.

"I am," Biden answered from the podium, where he'll speak later tonight.

In response to questions about his message, he said: "You'll hear it tonight."

-ABC News' Cheyenne Haslett

Rep. Dean Phillips, a former 2024 Democratic presidential candidate who was the first congressional Democrat to question Biden's candidacy, appeared on ABC News Live to discuss the state of the election since Biden dropped out of the race.

ABC News' Kyra Phillips asked the Minnesota congressman if he felt like he deserved an apology for being the first to say Biden should leave this race.

"Just walking into this room today ... that's the only apology I needed," he replied, adding: "It's the energy, the excitement. I was just begging for a party to listen. ... I don't need an apology. What I need is for us to win, and it feels pretty darn good here today."

Rep. Phillips said this convention "is a passing of the torch to the new generation. I think people want to leave here feeling something."

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Rep. Dean Phillips was 1st congressional Democrat to question Biden candidacy

The Minnesota lawmaker didn't receive much praise for calling on President Joe Biden to end his re-election campaign. He joins the show to discuss what's occurred since Biden dropped out of the race.

-ABC News' Isabella Meneses

President Joe Biden was seen doing a stage check Monday afternoon at the United Center in preparation for his opening night speech.

A march organized in support of Palestinians in Gaza during the DNC has started, hours before its first night of programming kicks off.

Organizers with the Coalition to March on the DNC, which represents more than 200 activist organizations, said about 15,000 people were present for a rally held in Union Park, near the convention site, ahead of the march.