It's not really lying so much as the big number is misleading. Ben Carson raised a lot of money during the primary, but he spent nearly all of it on direct mail fundraising to raise more money. Trump could be using a similar strategy where he is only really raising a third of the money he is reporting because he spent 2/3 of the money raising it.
Trump isn't Ben Carson. He's always been wary of campaign expenditures. Best I can tell, the actual Trump campaign's cash-on-hand went up by about $17 million from June, more than the actual Clinton campaign's net $14 million increase. That's despite the actual Trump campaign likely raising much less than the actual Clinton campaign for the month.
