Donald Trump's campaign said it raised nearly $300 million in May as it benefited from a new surge of support among small-dollar donors on top of an existing strength with billionaires. The potent combination is clearly helpful for Trump as he tries to close a fundraising gap with President Joe Biden ahead of a final campaign sprint this summer and fall. Though the full picture isn't yet available of how each candidate did in May, Trump's incoming money appears to be roughly split between groups catering to small and larger donors. Of the total, $141 million came into Trump's formal...