Vice President Kamala Harris’ campaign launched Tuesday a $50 million advertising campaign that features her first ad since becoming the presumptive Democratic presidential nominee.

The 60-second ad, titled “Fearless,” comes just weeks before the Democratic National Convention in Chicago.

The ad focuses on Ms. Harris’ career as a prosecutor and California attorney general. It also mentions her work while serving as vice president.

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“This campaign is about who we fight for,” Ms. Harris says in the ad. “We believe in a future where every person has the opportunity not just to get by, but to get ahead. Where every senior can retire with dignity.”

“But Donald Trump wants to take our country backward. To give tax breaks to billionaires and big corporations and end the Affordable Care Act,” she says. “But we are not going back.”

The ad will run on broadcast, cable and streaming services in battleground states. It will also run during the Olympic Games, along with highly watched shows.

“Throughout her career as a courtroom prosecutor, Attorney General, United States Senator, and now as Vice President, Kamala Harris has always stood up to bullies, criminals and special interests on behalf of the American people — and she’s beaten them,” Harris campaign chair Jen O’Malley Dillon said in a statement. “She’s uniquely suited to take on Donald Trump, a convicted felon who has spent his entire life ripping off working people, tearing away our rights, and fighting for himself.”

This ad campaign comes less than 10 days after President Biden dropped out of the presidential race and threw his endorsement behind Ms. Harris.