At the event on Monday, Ms. Epps-Johnson said the grants distributed by the center in 2020 helped fill a substantial void of resources for those overseeing elections in the United States. One town in New England, she said without specifying, was able to replace voting equipment from the early 1900s that was held together with duct tape.

“The United States election infrastructure is crumbling,” Ms. Epps-Johnson said.

In addition to the Center for Technology and Civic Life, Mr. Zuckerberg and Dr. Chan gave $69.6 million to the Center for Election Innovation & Research in 2020. At the time, that nonprofit group said that the top election officials in 23 states had applied for grants.

Republicans have been unrelenting in their criticism of the social media mogul and his donations.

While campaigning for the U.S. Senate on Tuesday in Perrysburg, Ohio, J.D. Vance, the “Hillbilly Elegy” author who has undergone a conversion to Trumpism, continued to accuse Mr. Zuckerberg of tipping the election in 2020 to Mr. Biden.

Mr. Vance, a venture capitalist, hasn’t exactly sworn off help from big tech. He counts Peter Thiel, a departing board member of Mr. Zuckerberg’s company, Meta, and a major donor to Mr. Trump, as a top fund-raiser. Mr. Thiel has also supported Blake Masters, a Republican Senate candidate in Arizona.

In an opinion piece for The New York Post last October, Mr. Vance and Mr. Masters called for Facebook’s influence to be curbed, writing that Mr. Zuckerberg had spent half a billion dollars to “buy the presidency for Joe Biden.”

In Colorado, Tina Peters, the top vote-getter for secretary of state at the state Republican Party’s assembly last weekend, has been a fierce critic of Mr. Zuckerberg, even after her arrest this year on charges stemming from an election security breach. Ms. Peters, the Mesa County clerk, is facing several felonies amid accusations that she allowed an unauthorized person to copy voting machine hard drive information.