Among those suggesting that Trump's polls' results are being understated is Robert Cahaly of The Trafalgar Group, one of the only nonpartisan outlets that predicted a Republican victory in 2016 after finding that Trump was leading in the key battleground states of Michigan and Pennsylvania.
This year Trafalgar's report in the final days leading up to the election has again found a small lead for Trump in both of those states, differing nearly every other general polls.
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In the last presidential election, the polling industry faced denunciation after projections greatly underrated Trump's chances of winning.
Cahaly said it's "quite possible" that the same will happen in 2020, again because a hidden Trump vote was overlooked. "There are more [shy Trump voters] than last time and it's not even a contest," Cahaly told on Monday.
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Susquehanna Polling and Research has also praised the hidden Trump voter theory, as its most recent poll put Trump and Biden shoulder to shoulder in Wisconsin and gave the president a four-point lead in Florida.
"There are a lot of voters out there that don't want to admit they are voting for a guy that has been called a racist," Susquehanna analyst Jim Lee told this week.
"That submerged Trump factor is very real. We have been able to capture it and I'm really disappointed others have not."
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But many pollsters have denied the idea that Trump voters are lurking, in part by discussing the reliability of Trafalgar's polling systems.
"[Trafalgar] doesn't disclose their 'proprietary digital methods' so I can't really evaluate what they're doing," Jon McHenry, a Republican pollster with North Star Opinion Research, said.
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"They're far enough out on a limb that a year from now, we'll all remember if they were very right or very wrong."
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McHenry said he thinks it's weird that Trump voters would lie about their voting plans when approached by pollsters, but acknowledged that data could be skewed if Trump voters are less likely to participate in surveys altogether.
However, he said that kind of "skewed response pattern" wouldn't necessarily result in worse predictions for Trump.
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He mentioned Pennsylvania as an example of a state where Democrats have been found to be less likely to speak to pollsters than Republicans, meaning that they may be underrepresented in the results.
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McHenry said that while he can not rule out response bias, he's "skeptical" of it. "It certainly wouldn't be enough to explain the national deficits we're seeing," McHenry said.
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