were John Smith, they would say I’m the greatest president in history and I blow Ronald Reagan away," Trump said in an interview for the book, according to the Examiner. "All these guys that if they looked at my agenda with a different name...and he got the biggest regulation cuts in history in less than two years, judges, environmental stuff, getting out of the Paris horror show. If you said that conservative president John Smith did that, they would say he’s the greatest president. Far greater than Ronald Reagan."

President Donald Trump walks on the South Lawn of the White House on November 27. Trump reportedly thinks his actual performance in the White House easily surpasses former President Ronald Reagan. Alex Wong/Getty Images

Trump has often been compared to Reagan,mostly because they both entered politics through the entertainment world.

While conservatives may laud Reagan's accomplishments now, Trump actually isn't far behind the former president as far as popularity is concerned. According to the FiveThirtyEight tracker of Trump's approval rating, he's about where Reagan stood at the same point in his presidency.

FiveThirtyEight had Trump's approval rating pegged at 42.5 percent on Tuesday, Day 677 of his presidency. On Day 677 for Ronald Reagan his approval rating was 43.1 percent, according to FiveThirtyEight.

Trump has favorably compared himself to Reagan before. For instance, in July he tweeted: "Wow, highest Poll Numbers in the history of the Republican Party. That includes Honest Abe Lincoln and Ronald Reagan. There must be something wrong, please recheck that poll!"

Despite that tweet, in reality, Trump's approval