Vice President Kamala Harris met with her top potential running mates Sunday in preparation for announcing her final choice for VP before Tuesday evening.

Harris, 59, had in-person meetings at the Naval Observatory with Pennsylvania Gov. Josh Shapiro, Sen. Mark Kelly (D-Ariz.) and Minnesota Gov. Tim Walz, according to multiple reports. She may have met with additional candidates virtually.

The vice president will make her decision public by Tuesday evening, when she is expected to appear with her VP in Philadelphia on the first stop of her multi-state swing.

Harris has been ruminating on her decision for days. The law firm Covington & Burling finished up its vetting process on her candidates on Thursday.

The firm had vetted a slate of candidates in less than two weeks since President Biden dropped his presidential bid, including Shapiro, Kelly, Walz, Kentucky Gov. Andy Beshear, Illinois Gov. JB Pritzker and Transportation Secretary Pete Buttigieg.

Shapiro, Kelly and Walz had all canceled events to meet with Harris over the weekend.

It’s unclear how Harris will announce her No. 2 — if it will be at the Pennsylvania rally or in a virtual format like video or text message, as reported by USA Today.

“Kamala Harris is picking her running mate any day now! This moment is historic, and as one of our campaign’s most faithful supporters, we want you to play a special part in it,” the campaign said in a registration sheet to receive the announcement by text message, per the outlet. “Add your name to be among the first to learn about Kamala’s VP pick when we break the news.”

Harris will likely consider the candidates’ personality, record and electability in her decision. Shapiro and Kelly are both from key battleground states.

Shapiro and Kelly are both from key battleground states that will be critical to Harris getting over 270 electoral points in November. Biden won Arizona and Pennsylvania narrowly in 2020 and the Harris campaign is battling for votes in both states to beat former President Donald Trump, who is close in the polls.

Shapiro has been a popular Democratic governor in Pennsylvania and could potentially swing the vote his way if he was VP. But some left-wing groups have leveraged an anti-Shapiro campaign on account of his previous policies toward Israel, raising questions on whether the far-left members of the Democrat party would be happy with Shapiro’s support for Israel.

 One group formed under the title “No Genocide Josh” called for Harris not to choose Shapiro, prompting fellow Democratic lawmakers to stand up for the governor and slamming the attacks as “antisemitic.”

Like Shapiro, Kelly could also push his local Arizona voters to be more energized to vote for their senator in November. 

The senator has been especially vocal on the border – a policy point that is important for Harris to navigate given the record-breaking border crossings under the Biden-Harris administration. 

Kelly is also a veteran and a retired NASA astronaut, bringing military experience to the ticket. However, his senate term is up in 2026, potentially causing concern that he should be present in the Senate to defend his seat in the tight state.

Polls show Walz has less name recognition than Kelly or Shapiro. He is not from a hotly contested battleground state – although the Trump team has made moves to claim Minnesota and have said they see it as a swing state. 

Walz could give Harris more momentum in Minnesota to help secure the state and has been one of Harris’ most vocal supporters in the race, helping out the DNC and attack Trump and his VP pick Sen. JD Vance (R-Ohio.)

The Democratic National Committee said Friday that Harris had already received enough delegate support to become the Democratic nominee. The final delegate vote in the virtual roll call is due at 6 p.m. ET Monday.

Harris’ VP choice will then likely be approved by the DNC chair, according to the DNC rules.

Former House Speaker Nancy Pelosi (D-Calif.) stressed the importance of Harris’ choice on Monday.

“It’s a difficult decision because they are all so great,” she told ABC News’ George Stephanopoulos on “Good Morning America.”

“It is the most important decision for her to make. Not just about who can help win, but who can help serve and lead and whose confidence she trusts,” Pelosi added.