Trump debate challenge: Keeping his cool if Clinton attacks

WASHINGTON -- Donald Trump's advisers are urging him to keep his cool during next week's presidential debate and resist attempts by Hillary Clinton to provoke him with questions about his business record, wealth or controversial comments about minorities.

The focus underscores the campaign's concern too many Americans still don't believe the Republican has the temperament to be president, which could make a difference in a close race with Clinton.

"He can't let Hillary get under his skin," said Newt Gingrich, the former House speaker and Trump adviser.

Gingrich is part of a rotating cast of politicians and policy experts traveling with Trump on his private plane for mid-flight debate preparations, according to Republicans familiar with the preparations. Others include retired Lt. Gen. Mike Flynn, who is advising Trump on national security, and economist Peter Navarro.

New Jersey Gov. Chris Christie, a loyal Trump supporter, has been helping on issues such as the federal government's relationship with the states.

Trump has eschewed the kind of mock-debate setups candidates traditionally use to get ready for the high-pressure events and hasn't tapped anyone to play Clinton in his prep sessions. But aides said he is studying written briefing material on domestic and international issues and is talking through topics with advisers.

"He's a formidable, well-prepared candidate with a formidable, well-prepared team," said Navarro, a professor at the University of California, Irvine.

Some Trump aides are more concerned about Trump's disposition on the debate stage than his command of the issues, according to Republicans who insisted on anonymity because they were not authorized to discuss the private debate preparations publicly.

In particular, Trump advisers are trying to steel him for the likelihood Clinton will aim to get a rise out of him on live television in front of what both campaigns expect to be a record-setting audience.

The Republican long has lashed out at critics in deeply personal ways, especially after a perceived slight.