President Trump's campaign manager says polling is no longer reliable, days after a big leak of unflattering internal polling data.

"I just think the country is too complex now to call a couple hundred people and ask them what they think," Brad Parscale told CBS News hours ahead of Trump's event Tuesday evening in Orlando, Fla., to officially kick off his 2020 campaign.

"There are so many ways and different people who show up and vote now. The way turnout works now," he said. "The abilities we have now to turn out voters. The polling can't understand that. And that's why the polling was so wrong in 2016. It was 100% wrong. Nobody got it right — not one public poll. The reason why — it's not 1962 anymore."