The campaign and the R.N.C. said they had a combined $100 million in cash on hand, and that they had raised more money online in the second quarter than in the first half of 2018. The staggering total figure can be plowed into television and digital advertising, get-out-the-vote efforts and other activities related to the 2020 election.

Mr. Trump and his committees raised $54 million, they said, and the R.N.C. raised $51 million. The campaign officials did not say how many individual donors had contributed, or how many gave money in increments of $200 or less. The official report, which will include spending, will be filed with the Federal Election Commission on July 15.