Donald Trump may be willing to give $1 billion of his own money to his presidential campaign, it was revealed Wednesday afternoon.During an appearance on Fox News' "The Real Story with Gretchen Carlson," Trump spokesperson Katrina Pierson said the presumptive GOP presidential nominee could shell out a truckload of his own money — even if that means dipping into his real estate business."As Mr. Trump has already said. He'd be willing to commit a billion dollars of his own money to make America great again," Pierson told Carlson."Like he said, he would sell a building. He would definitely do that for the country. He's talking about helping out senate races, congressional races. The Republican Party doing fundraisers for the RNC, definitely. It's going to be a joint effort."Pierson was referencing Trump's comments on "Fox & Friends" Wednesday morning, in which he seemingly joked about selling some of his real estate to continue funding his campaign. Trump did say, however, that he would likely have to raise money for his general election campaign as well."We'll have to sell a building," Trump said. "I think that probably I'm looking — I'm not looking for myself. I'm looking for the party, where the party is going to receive a lot of money so the party can compete, including at Senate races, including at congressional races. You know, I think that's a big part of it. That's a big part of what I want to do."Trump has spent roughly $36 million of his own money during this primary season, reported the Boston Globe last week. Judging by his comments and the remarks made by his spokeswoman Wednesday, it's still unclear whether Trump will continue to self-fund, solicit donations, or employ a combination of both should he become the Republican nominee.Trump's convention manager Paul Manafort said last week his boss has not decided whether to accept money from big Republican donors moving forward.