Republican National Committee chief strategist Sean Spicer suggested on Tuesday that Democrats may be overconfident in their nationwide ground operation, and said the GOP has had an army of staffers working to court voters since 2013.

“When you look at the number of people that we have both paid and unpaid that are committed on a full-time basis to getting out, knocking on doors on a daily basis, we have the most sophisticated ground game, bar none,” Spicer, who also serves as a senior adviser to Donald Trump’s presidential campaign, said on CNN.