PUBLISHED: 01:18, Wed, Sep 9, 2020 | UPDATED: 01:33, Wed, Sep 9, 2020
The president is currently trailing his Democratic rival Joe Biden in national opinion polls. In 2016 Mr Trump spent $66million (£50.9million) of his personal fortune to secure re-election.
However, it is highly unusual for a sitting president to make substantial contributions to their own re-election campaign.
Mr Trump made the surprise announcement to reporters at Joint Base Andrews outside Washington before departing to deliver a speech in Florida.
Speaking to the assembled journalists he said: “If I have to, I would. But we don’t have to.”
The president added he will do “whatever it takes” to ensure he is re-elected in November.
Donald Trump could put up to $100 million towards his re-election campaign (Image: GETTY)
Trump addressing supporters in North Carolina (Image: GETTY)
In August Mr Biden’s campaign hit a new record by raising $365million (£281.6million) in one month.
The previous high, $193million (£148.9million), was hit by Barack Obama in 2008.
Mr Trump’s campaign has yet to disclose how much it raised in August.
However, the Republicans claim they raised over $76million (£58.6million) during the four day Republican National Convention.
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Trump supporters await the President's arrival in Florida (Image: GETTY)