Vice President Kamala Harris’ campaign raised $310 million in July, her campaign announced Friday, twice that of former President Donald Trump.

More than $200 million came in the first week of Ms. Harris’ assumption to the top of the Democratic ticket after President Biden dropped out of the race last month.

Her campaign said more than two-thirds of the fundraising came from first-time donors, with 94% of donations less than $200. Teachers and nurses were the most common occupation for campaign supporters, according to her campaign.

Mr. Trump’s $137 million came after he survived an assassination attempt and headlined the Republican convention last month.

The Harris campaign and its affiliated committees have a $377 million war chest, a $50 million advantage over Mr. Trump’s $327 million, according to data released by both candidates this week.

The donations lift the fundraising for the combined Biden-Harris campaigns above $1 billion, the fastest across that threshold, the Harris team said.

“This is a history-making haul for a candidate who will make history in November,” Julie Chavez Rodriguez, Ms. Harris’ campaign manager, said in a statement. “The tremendous outpouring of support we’ve seen in just a short time makes clear that the Harris coalition is mobilized, growing and ready to put in the work to defeat Trump this November.”

Democrats have seen a surge in enthusiasm for Ms. Harris following Mr. Biden’s exit from the race. She has garnered endorsements from all top Democrats, and her nomination hasn’t been contested.

• Jeff Mordock can be reached at jmordock@washingtontimes.com.