By Douglas Whitbread Donald Trump has asked diners to fork out more than $800,000 (£633,000) for a seat on his table at a fundraising event – as he seeks to out-raise Joe Biden in the run-up to the election. The ex-president could walk away with as much as $43million (£34million) following the dinner in Palm Beach, Florida, today (Saturday) where dozens of his wealthy billionaire backers are set to attend. Trump originally struggled to pull in sizeable cash donations, with several of his former supporters deciding to spend their money on other Republican nominees’ campaigns for the White House…