Vice President Harris is meeting with top running mate candidates Sunday at her residence at the Naval Observatory in Washington, D.C., according to a source familiar with the matter.

Harris is meeting with at least three leading contenders -- Arizona Sen. Mark Kelly, Minnesota Gov. Tim Walz and Pennsylvania Gov. Josh Shapiro, according to the source.

The meetings were earlier reported by The New York Times.

-ABC News' Selina Wang

In a Fox News interview Sunday, Sen. JD Vance responded to criticism of him being picked as former President Donald Trump’s running mate, saying he takes it as a "badge of honor."

"All I can do is go out there and prosecute the case against Kamala Harris to remind people that things were more prosperous and more peaceful when Donald Trump was president," Vance said. "Look, I recognize there are a lot of folks even in the GOP establishment and certainly on the far left who don't like the fact that Donald Trump picked me, I actually take their criticism as a badge of honor."

Vance also hit back at Democrats who’ve called him "weird," calling it "a lot of projection."

"They can call me whatever they want to. The middle school taunts don't bother me," he said. "What offends me is what Kamala Harris has done to this country over three and a half years."

-ABC News' Lalee Ibssa, Soo Rin Kim, Kelsey Walsh and Hannah Demissie

Vice President Kamala Harris' presidential campaign announced Sunday that it would be launching a "Republicans for Harris" program aimed at reaching Republican voters who could be convinced to vote for Harris. The program will include digital advertising, phone banking, events and other initiatives, according to the campaign.

The program -- and Harris herself -- have been endorsed by a number of Republican figures, including former Trump White House press secretary Stephanie Grisham.

"I might not agree with Vice President Kamala Harris on everything, but I know that she will fight for our freedom, protect our democracy, and represent America with honor and dignity on the world stage," Grisham wrote in a statement released by the Harris campaign.

The "Republicans for Harris" program will hold kickoff events starting this week, per the campaign.

-ABC News' Gabriella Abdul-Hakim, Fritz Farrow, Will McDuffie and Oren Oppenheim

Vice President Kamala Harris plans to meet with some of the top vice presidential contenders in person in Washington, D.C. this weekend, including Gov. Josh Shapiro, sources familiar with the matter told ABC News.

One source, who spoke to Shapiro yesterday, said he canceled everything on his schedule this weekend for Harris. He also canceled his appearance at a previously scheduled commissioner’s meeting at his own residence next week, the source added.

Shapiro said he was feeling "super confident," according to the source.

-ABC News' Selina Wang