Clinton does have someone playing Trump in her mock face-offs but the campaign won't say who that person is - but it's not Darrell Hammond

Candidate is also 'preparing for the different Trumps that might show up,' said the senior aide

ormer secretary of state and U.S. Senator will be asked more difficult questions than her opponent

Hillary Clinton's camp began the debate dance on Wednesday, working to set expectations for the Democrat's performance in next week's high-profile skirmish.

A senior aide told reporters several times this afternoon that Brooklyn's 'biggest concern' is that moderators, in this case NBC's Lester Holt, will go easy on Donald Trump during the clashes.

Clinton Communications Director Jen Palmieri said the campaign is worried 'a low bar' is being set for Trump and the former secretary of state and U.S. Senator will be asked more difficult questions than her opponent.

'My biggest concern is what kind of standards he is held to,' Palmieri told reporters traveling with the candidate.

The candidate is also readying herself to take on either iteration of Trump - the statesman and the provocateur.

'We are preparing for the different Trumps that might show up,' said the senior aide.

Hillary Clinton's camp began the debate dance on Wednesday. A senior aide told reporters several times this afternoon that Brooklyn's 'biggest concern' is that moderators, in this case NBC's Lester Holt, will go easy on Donald Trump during the clashes

With Trump, 'you're not sure who's going to show up, so you have to assume that he might approach the debate this way or that way,' she said. 'He may be aggressive or he may lay back. That's hard to game out.'

The campaign official emphasized that Brooklyn's apprehensiveness is not related to Clinton's performance last week in a commander in chief forum or a specific debate moderator.

Their worry is that 'people accommodate their questions, and lower the bar of their questions to suit the candidate in front of them - and that's what happened with Trump in the past.'

Moderators may 'ask Hillary Clinton a set of much harder questions and ask him easier questions because he has not put forward a set of detailed material.

'And so he ends up getting much more one-dimensional and simple questions,' Palmieri stated, 'and that is not what you be expected of somebody who's looking to be president of the United States.'

Trump has also opined about the moderators. 'Look, it's a phony system. Lester is a Democrat. I mean, they are all Democrats. OK? It's a very unfair system,' Trump told Fox News' Bill O'Reilly.

Holt, the wire service Reuters says, is actually a registered Republican.

Only one of the four general election moderators is affiliated with the Democratic Party, and that's Fox News anchor Chris Wallace.

He's said in the past that his voter affiliation is a reflection of Washington, D.C. politics, where Republicans have been out of power for more than a 100 years and the Democratic primary is only open to party registrants.

But Trump also expressed anxiety that Holt could turn up the heat on him in response to criticism of his colleague Matt Lauer for his handling of the candidates during a military forum.

Lauer was highly criticized for the reasons Clinton's camp put forward today - he gave Trump a pass and roughed up the ex-cabinet official too much.

The campaign is worried 'a low bar' is being set for Trump and the former secretary of state and U.S. Senator will be asked more difficult questions than her opponent

Palmieri's assertion that her candidate may be at a disadvantage during the debates despite Clinton's years of experience in that setting first as a Senate candidate and then as the the runner up in the 2008 battle for the Democratic nomination to the White House accents the importance of the nationally televised brouhaha.

The senior official acknowledged Wednesday that it's the 'most important night of the entire election' so far.

'I'm sure she will perform well. She always does and so our concern is just what kind of standard is he held to,' Palmieri said.

Clinton has been prepping for the debate, the campaign official stated, declining to say how many hours she had spent on it.

'She thinks it's important, and she thinks you should prepare,' Palmieri said.

That doesn't necessarily mean she's standing in a room with a Trump stand-in every day, though, the aide said.

'She has materials that she reviews every day, but it's not as if shes practicing.'

Clinton does have someone playing Trump in her mock face-offs but the campaign won't say who that person is.

Reporters attempted to guess the identity of campaign's Trump on Wednesday with no success.

Palmieri said guessers could cross at least two names off the list, however.

It is not former Saturday Night Live cast member Darrell Hammond, who still appears on the show from time to time to do impersonations of both Bill Clinton and Trump.

Nor is it Congressman Joseph Crowley, a Democrat from New York who name had popped up as an option.