Washington, October 3 (RHC)-- U.S. Democratic presidential nominee Hillary Clinton raised $154 million in September, the campaign's biggest fundraising haul so far in the race for the White House.

Of the total figure, $84 million was directly raised by Clinton's campaign committee, up from the $62 million in August, according to the former secretary of state's campaign.  An additional $70 million was raised by the Hillary Victory Fund, which finances the campaign, the Democratic National Committee and various state parties.

Over 900,000 people donated to "Hillary for America" in September, the statement read, adding that the average donation for the month stood at around $56.  Despite the high numbers, Clinton's campaign manager called for more contributions to fight Donald Trump, the Republican nominee.

"With Donald Trump promising to dump an additional $50 million of his own money into the campaign and right-wing billionaires pledging millions more, we must continue to step up in order to have the resources we need to mobilize millions of voters across the country," Hillary Clinton's campaign manager Robby Mook said.

The call for more donations surprised some experts as Clinton's campaign has already raised more than $989 million since she entered the race in early 2015.  The figure puts her well ahead of Trump, who earned $90 million for his campaign in August and has invested $60 million of his own money.

Compared with the 2012 campaign, Clinton's earnings dwarfed those of President Barack Obama, who had raised $110 in September that year.   The 2012 vote was the most expensive presidential race on record, as both Obama and his Republican rival Mitt Romney raised well over $1 billion.

Clinton is enjoying financial support from a growing list of American billionaires who oppose Trump.  So far, movie producers Steven Spielberg and Jeffrey Katzenberg, financiers Warren Buffett and George Soros, and Wal-Mart heiress Alice Walton have all made contributions to the former first lady's campaign.    This is while some of the Republican-leaning billionaires have announced that that they will not support Donald Trump as the party nominee.