The practice of tailoring polls to show a desired result goes on during campaigns, pollster John Zogby told Newsmax TV.

During an interview with Steve Malzberg on "America Talks Live," Zogby said it's a way to influence what the public thinks about a particular candidate.

In the current presidential election, most polls show Democrat Hillary Clinton with a significant lead over Republican Donald Trump. Zogby said Clinton is likely leading by a very small margin.

The practice of pollsters colluding with campaigns happens, but it's not normal to do so.

"It's normal for the Clintons," Zogby said.

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Oversampling also occurs. Zogby said in the run-up to the 2012 presidential election, Public Opinion Strategies conducted a poll that showed Republican Mitt Romney defeating President Barack Obama. Obama, however, ended up winning by 126 electoral votes.

Trump said Monday Democrats are creating "phony polls" to help suppress the vote ahead of election day.

The results of a Rasmussen poll that came out Monday showed Trump with a 2-point lead. The RealClear Politics polling average has Clinton up 5.1 points.

Zogby is author of the book "We are Many, We are One: Neo-Tribes and Tribal Analytics in 21st Century America," which is available on Amazon.