Harris launched her campaign Sunday after President Joe Biden bowed to pressure from his own party to step aside, leaving a historically compressed timeline for her to make a selection before next month's Democratic National Convention. Her party could make her its nominee as soon as Aug. 1 in a virtual vote, and could formalize the nomination of her running mate soon after.

Harris' goal, according to people with knowledge of the matter, is to keep the process drama-free, as she and Democrats try to project confidence after an extraordinarily tumultuous few weeks for the party.

While much of the political conversation has centered on four names -- Arizona Sen. Mark Kelly, Pennsylvania Gov. Josh Shapiro, Kentucky Gov. Andy Beshear and North Carolina Gov. Roy Cooper -- Harris' team has requested information from about a dozen officials, according to the people, who spoke on the condition of anonymity to discuss the confidential process.

The broader list includes Transportation Secretary Pete Buttigieg, Commerce Secretary Gina Raimondo, Illinois Gov. J.B. Pritzker, Michigan Gov. Gretchen Whitmer and Minnesota Gov. Tim Walz. At least one of those being vetted is not currently in government.

Initial requests for information went out Tuesday, one of the people said.

Shapiro, who on Tuesday said he had not received any requests for vetting material, was less categorical Wednesday. He referred questions about the process to Harris' campaign team.

Eric Holder, the former U.S. attorney general, and a team of lawyers at his firm Covington & Burling are taking the lead on vetting potential choices. Typically, those under consideration are asked to turn over financial records and records of past political stances and speeches, and they are asked to submit to interviews with lawyers to identify potential red flags.

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AP writers Marc Levy in Harrisburg, Pennsylvania, and Chris Megerian in Washington contributed to this report.