Rep. Devin Nunes’ campaign war chest topped $7 million in September after an aggressive third quarter fundraising haul of more than $2.5 million.

The California Republican has built a potent fundraising operation fueled mostly by small, grassroots donors. Nunes’ fundraising prowess coincided with his role as an outspoken defender of President Trump from his perch as the top Republican on the House Intelligence Committee — first as chairman during the Russia investigation and now as ranking member amid the impeachment inquiry being driven by Democrats in the House of Representatives.