Trump, the Republican presidential nominee, has so far been badly outspent by his Democratic rival, Hillary Clinton, and groups supporting her. Since clinching her party's nomination in early June, Clinton has spent more than $77 million on television and radio advertising, largely targeting voters in battleground states, according to Kantar Media's political ad tracker. Trump senior communications adviser Jason Miller said in a statement that the billionaire businessman's "positive message of economic opportunity is working and we see the national and battleground state polls all moving in the right direction."