Advisers say Republican Sen. John McCain has raised more than $15 million in March for his presidential campaign.
The total is his best fundraising month since he began the campaign.
He still raised less than the Democrats in the race, Barack Obama and Hillary Rodham Clinton. Obama raised more than $40 million in March and Clinton raised more than $20 million.
The campaign officials spoke to The Associated Press on condition of anonymity because the numbers haven't been made public.
Altogether, McCain has raised about $75 million for his presidential campaign. Obama has raised about $234 million and Clinton has raised more than $175 million.
McCain on March 4 locked up enough delegates to be assured the nomination.