It could be the defining moment of the 2016 campaign.

Monday's first presidential debate between Democrat Hillary Clinton and Republican Donald Trump may draw, by some estimates, 100 million viewers, who will be able to take the measure of the candidates for the first time on the same stage together.

The stakes for both contenders are enormous. Viewers will not only be paying attention to what is said, but how it's said and how the candidates react to one another.

The debate will be a key moment for Trump, who has closed the polling gap in recent weeks against Democrat Hillary Clinton in part because he has presented himself as more disciplined than he has in the past. He has also focused on his central theme.

“We will make America strong again. We will make America safe again, and we will make America great again!” Trump told supporters at a rally in Fort Myers, Florida, one of the critical swing states where he has drawn even with Clinton in recent polls.

For her part, Clinton looks to the debate to reassure her supporters and to push her message of wanting to build a more inclusive economy, as she did during a recent rally in Orlando, Florida. “We are all of value. In the United States of America, the greatest country in the world, we believe everyone is created equal!”

Trump and Clinton appear to be prepping for the debates in different ways. Clinton has spent a lot of time in debate practice, including mock face-offs with surrogates portraying Trump.

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