California Sen. Kamala Harris is scaling up her focus on Iowa, promising to bring on at least 65 paid staffers by July and launch a summer organizing push targeted at the precinct level.

"It's game on," said Harris' Iowa campaign chairwoman, Deidre DeJear.

Harris so far has lagged behind some campaigns, which have sought to aggressively add staff in the state. In April, her campaign tallied just five paid staffers here while others, such as Massachusetts Sen. Elizabeth Warren, had brought on nearly 50.

She's also made fewer visits to Iowa than many of her competitors, holding 17 events over 7 days, according to Des Moines Register data. Harris canceled her most recent Iowa trip to ensure she could vote on the disaster relief bill in the Senate, and a previous trip was derailed because of snow.

DeJear said the slower build-up here was an intentional effort to conserve resources, ensure organizers don't burn out, and wait for potential caucusgoers to become more engaged.

"Our campaign has been really strategic about ensuring that we are building a campaign that’s going to last throughout the duration of this caucus season and give her a springboard into Super Tuesday and all of the other elections that are going on throughout the country," DeJear said.

DeJear said Harris' return Sunday to the Iowa Democrats' Hall of Fame event in Cedar Rapids will act as a launching point for the campaign's organizing push here.

Harris will return the first week of July and again July 16 for a forum in Davenport.

Later this summer, the campaign plans to roll out a "Kamala Captains" program focused on finding precinct-level leaders to identify supporters in their neighborhoods and keep them engaged throughout the cycle.

Iowa's Democratic caucuses take place across roughly 1,700 different precincts. Well-organized campaigns identify leaders in each who can manage the flow of events and supporters on caucus night.