BALTIMORE (AP) — Sen. Kamala Harris of California raised $12 million in the past three months, her presidential campaign said Friday.

Harris's second-quarter total is less than some other first-tier 2020 White House hopefuls, who have already released their totals ahead of the July 15 deadline to report to the Federal Election Commission. South Bend, Indiana Mayor Pete Buttigieg brought in $24.8 million , former Vice President Joe Biden raised $21.5 million and Senator Bernie Sanders of Vermont collected $18 million, their campaigns said.

Harris's announcement comes a week after the first presidential debate, during which she confronted Biden over his comments about his decades-old relationship with segregationist senators and his record on public school busing during the 1970s. Since then, her campaign has sought to capitalize on the moment.

Previously, her campaign said it received online donations from roughly 63,000 people in the 23 hours following the debate, and that more than half of those donors had not previously supported her campaign.

The Harris campaign added Friday that, of the money she raised this quarter, half a million dollars came from her online store.

The campaign is pointing to sales of a shirt that fundraises on the moment from her exchange with Biden during first Democratic presidential debate. The shirts include a childhood photo of Harris, who at the debate discussed her childhood experience with the busing integration of elementary schools in Berkeley, California, in 1968.

The $12 million that Harris raised is roughly equal to what the California senator brought in the first fundraising quarter, which ended on March 31.

Also Friday, Steve Bullock reported $2-plus million in contributions during the second quarter. The Montana governor entered the 2020 primary race in mid-May, halfway through quarter.

Bullock's campaign said he racked up that fundraising haul without any transfers of money from other accounts. He missed the polling qualification cutoff for the first Democratic presidential debates in Miami, but has a strong prospect of making the stage for this month's second set of debates in Detroit.