Federal election filings show the Trump campaign laid out $50 million last month, about twice as much as the month before. The Democratic former vice president, in contrast, spent considerably less: $37 million. A big chunk of that went to digital ads, where Biden's spending rose almost a hundred-fold, from about $175,000 in May up to nearly $17 million in June.

Subscribe: http://smarturl.it/reuterssubscribe

Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled.

Get the latest news on: http://reuters.com/
Follow Reuters on Facebook: https://www.facebook.com/Reuters
Follow Reuters on Twitter: https://twitter.com/Reuters
Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en