When it comes to electing a vice president, things may look different.

Although Pennsylvania Governor Josh Shapiro and Arizona Senator Mark Kelly were among the possible finalists, both have faced criticism from some organizations and activists who otherwise support Democratic causes, which could undermine the party’s newfound unity barely two weeks after Harris entered the race.

The vice president’s team says she is interviewing six possible candidates over the weekend before announcing them on Monday. The next day, she and her running mate will appear together at a rally in Philadelphia and then visit six other swing states.

In addition to Shapiro and Kelly, Harris is reportedly also considering the candidacies of Minnesota Governor Tim Walz, Illinois Governor JB Pritzker, Kentucky Governor Andy Beshear and Transportation Secretary Pete Buttigieg.

Walz changed his travel plans for the weekend, but his office did not respond to a question Saturday about whether the interview was for an interview with Harris. “The governor’s schedule has changed and he will no longer be traveling to New Hampshire this weekend,” Walz spokesman Teddy Tschann said.

Some Democrats in Congress have promoted Kelly, a former Navy pilot and astronaut whose state has a more than 370-mile border with Mexico. They say his selection could help defuse attacks from the Republican nominee, former President Donald Trump, who argues that the Biden administration’s immigration policies are too lax.

Shapiro also has prominent supporters, including Philadelphia Mayor Cherelle Parker, who caused a stir when she released a video on Friday in which several Philadelphia officials and Democrats endorse Harris but also list Shapiro as her running mate – suggesting the mayor was aware of Harris’ decision.

But a person familiar with the mayor’s thinking said the video simply shows Parker supporting both Harris and the possibility that Shapiro, Parker’s friend, could be nominated as a vice presidential candidate. The person was not authorized to discuss the matter publicly and spoke on condition of anonymity.

Both Kelly and Shapiro watched their critics grow louder as Harris moved closer to a decision.

While this may not ultimately convince Harris, it is an indication that the vice president’s honeymoon phase, in which the different wings of the Democratic Party rallied behind her, may be coming to an end less than two weeks after President Joe Biden dropped his candidacy for re-election and endorsed Harris.

Some unions have criticized Kelly for opposing a bill that they believe would strengthen the labor movement. The senator’s office responds that although he is not a co-signer of the bill, he has said he will vote for it in the House.

But Shawn Fain, president of the United Auto Workers, said his 370,000-member union, while supporting Harris as a presidential candidate, is not backing Kelly as a possible running mate. Fain also said the union has no preference for Shapiro, who has previously shown willingness to join Republicans in calling for an expansion of voucher programs that allow public tax dollars to flow to private schools.

Fain particularly praised Beshear, Walz and Pritzker.

“There’s probably a thousand people telling her the same thing, you know, what they’re thinking,” Fain said in an interview. “And so she has to make the decision based on what she thinks is best for her.”

The nonprofit Institute for Middle East Understanding publicly commented on the matter, saying in a statement that Shapiro was “not the right candidate for the post and his selection would be a step in the wrong direction.”

Shapiro, who said he plans to attend Harris’ rally in Philadelphia on Tuesday, has aggressively opposed what he sees as the anti-Semitism emerging at pro-Palestinian demonstrations and expressed solidarity with Israel, which is seeking to eliminate Hamas in Israel’s fight against the insurgents in the Gaza Strip.

Shapiro accused universities of not acting quickly enough to combat anti-Semitism and became a prominent critic of University of Pennsylvania President Liz Magill. She resigned after testifying at a congressional hearing where, despite repeated questioning, she was unable to say that calls for genocide against Jews on campus violated the university’s code of conduct.

Shapiro also criticized Israeli Prime Minister Benjamin Netanyahu, saying that any end to the war between Israel and Hamas would require the disempowerment of Hamas.

The governor was criticized by the Council on American-Islamic Relations for not condemning Israel for the killing of civilians in Gaza and for not calling on Israel to stop fighting in the territory. Shapiro countered that he had met with Muslim Americans and understood their pain.

The progressive activist organization RootsAction.org disagrees with Shapiro’s views on Israel, education vouchers and the environment, to name a few. It says that with her decision to consider Shapiro, Harris “raised alarm bells among young people, racial justice activists, Arab Americans, Muslims and others whose votes and campaign activities were critical to defeating Trump four years ago.”

Meanwhile, the Philadelphia Inquirer has revived an opinion piece Shapiro wrote in 1993 as a 20-year-old student at the University of Rochester, in which he claimed that there would “never be peace” in the Middle East and that the Palestinians were “too belligerent” to coexist with Israel.

When asked about it, Shapiro replied, “I was 20,” adding that he had long supported a two-state solution to the Palestinian-Israeli conflict.

“I hope we will see a day when there is peace in the Middle East,” he said.

Some environmentalists and residents of the rural town of Dimock, Pennsylvania, are also against Shapiro. They have written a letter to Harris urging her not to vote for Shapiro. They accuse the governor of failing to keep his promises to clean up the region’s groundwater, which has been contaminated by fracking for natural gas extraction.

Associated Press writers Marc Levy in Harrisburg, Pennsylvania, and Josh Funk in Omaha, Nebraska, and AP Auto Writer Tom Krisher in Detroit contributed to this report.