Harris rallied voters in battleground Wisconsin on Tuesday, her first presidential campaign event since securing enough delegate pledges for the Democratic nomination if they keep their word -- and used the rally to sharply frame her race against former President Donald Trump.

Harris attacked Trump and his running mate, Ohio Sen. JD Vance, on the issue of abortion and Project 2025, the conservative presidential transition blueprint fronted by the Heritage Foundation.

"We'll stop Donald Trump's extreme abortion bans because we trust women to make decisions about their own body and not have the government tell them what to do," Harris said to raucous applause. "And when Congress passes the law to restore reproductive freedoms, as president of the United States, I will sign it into law."

During the rally, Harris touted her previous experience while making a dig at Trump.

"In those roles, I took on perpetrators of all kinds: predators who abused women, fraudsters who ripped off consumers, cheaters who broke the rules for their own gain," she said. "So, hear me when I say, I know Donald Trump's type."

-ABC News' Fritz Farrow and Sarah Beth Hensley

Biden briefly spoke with reporters as he boarded Air Force One at Dover Air Base on Tuesday.

The president, who tested negative for COVID-19, said he was "feeling well," and didn't respond to questions about bowing out of the race.

Biden had a mask in hand, which he placed in his pocket after he got out of the car before getting on the plane.

The president gave a salute and a thumbs up as he boarded.

-ABC News' Cheyenne Haslett

Senate Democratic Leader Chuck Schumer and House Minority Leader Hakeem Jeffries voiced their strong support for Harris to be the Democratic nominee for president in a press conference Tuesday afternoon.

"We are here today to throw our support behind Vice President Kamala Harris," Schumer said.

"We are brimming with excitement, enthusiasm and unity," Schumer said as he announced that Harris would be the candidate. "She said she would work to earn the support of our party and boy did she do so, in quick order."

Schumer noted a "surge of enthusiasm from every corner of our party uniting behind Vice President Harris." He touted her record and said her candidacy is the "next chapter in our quest" to ensure former President Donald Trump does not become retake the White House.

Jeffries said Harris is "ready, willing and able to lead us into the future."

"I am proud to strongly endorse Kamala Harris to be the 47th President of the United States of America," Jeffries said.

-ABC News' Allison Pecorin

The White House has just sent details on two upcoming trips, one for Vice President Kamala Harris this week and one for President Joe Biden next week.

Harris will travel to Indianapolis on Wednesday to attend the biennial convention of one of the nation's largest historically Black sororities. This will be on the heels of her visit to Milwaukee today.

Biden will travel to Austin next Monday, July 29 -- a rescheduled visit to the LBJ Presidential Library for the 60th Anniversary of the Civil Rights Act. The president didn't go last week, as originally scheduled, in the aftermath of the assassination attempt.

-ABC News' Cheyenne Haslett