Donald Trump. AP Presumptive Republican presidential nominee Donald Trump said on Wednesday he will probably work with the Republican National Committee to raise $1 billion to beat likely Democratic rival Hillary Clinton in the Nov. 8 presidential election.

"We're going to try and raise over a billion dollars which is what's going to be necessary. The Democrats maybe will get as high as two billion dollars," Trump said in an interview with NBC Nightly News.

Trump has relied largely on his own fortune to finance his primary campaign, which according to Open Secrets has spent almost $50 million so far.

Throughout the primary, Trump has insisted his self-funding makes him immune to money's corrupting influence in politics.

But the businessman reversed course in March by saying he would raise money for a pricey general election fight, according to CNN.

"I'm not looking for myself, I'm looking out for the party, so the party can compete in Senate races and House races. I want to raise money for the party," Trump said on the Fox News program "Fox and Friends."