Walz introduced himself to the country and touted his accomplishments.
The third night of the Democratic National Convention continued the themes of joy and freedom.
A who's who of speakers, including a surprise speech from Oprah Winfrey, headlined the night aimed to showcase vice presidential nominee Minnesota Gov. Tim Walz.
"Coach Walz" brought his energy to the crowd touting his and Vice President Kamala Harris' vision for the future of the country.
Olivia Troye, a former Trump White House National Security official, told the crowd that "being inside Trump's White House was terrifying."
"But what keeps me up at night is what will happen if he gets back here," she continued.
She said she is proud to support Harris because they agree on the most important issue -- "protecting our freedom."
Democrats are trying to make progress with voters when it comes to immigration and border security.
A recent ABC News poll found Donald Trump retains the upper hand on the issue, keeping the race a closely contested one.
Trump leads Harris by 10 points in trust to handle the immigration situation at the U.S.-Mexico border, though he had led by 14 points in July.
Texas sheriff: Trump 'made our jobs harder'
At the DNC, speakers are bashing Trump for encouraging congressional Republicans to kill the bipartisan border deal negotiated earlier this year.
"He is a self-serving man," Javier Salazar, the sheriff of Bexar County, Texas, just said on stage. "Just like when he killed the border bill, he just made our jobs harder."
Olivia Troye, a former Trump White House National Security official, is on stage -- one of several Republicans scheduled to speak during the DNC this week.
In 2020, the New Jersey senator mounted a campaign for the Democratic nomination after decades on the rise within the party.
The theme of his campaign was unity and love. His optimistic messaging was on display again tonight as he spoke.
"We're not going to lose our faith," he said. "Look, I want everybody in here to let us all say it together: I believe in America."
The crowd repeated the phrase back to him.
