Longtime Republican pollster and Trump advisor Kellyanne Conway explained on the Today show that the hidden vote is seen when anonymous online polls are compared to phone call interview polls where people have to be more public in stating who they support.

For example, the new Reuters poll had Trump and Hillary Clinton just three points apart, where others that are phone survey based out Sunday showed a greater gap.

“The Reuters poll, which is an online poll, where Donald Trump is three points behind Hillary Clinton nationally, and I think that the important point to note there is that when you have online polls as opposed to telephone polls, Mr. Trump tends to do better, and that’s because the online polls approximate the ballot box, where you’re issuing your vote privately,” she said.

“We think there’s a big hidden Trump vote in this country,” said Conway, who added that Trump internal polls project “tighter” results in battleground states.