Donald Trump and Hillary Clinton face different challenges in first debate
Donald Trump needs to prove to voters that he has the policy depth and gravitas to serve as commander in chief while Hillary Clinton needs a moment to connect with Americans who question whether she can be trusted.
In an election year that has upended political convention, the candidates' best opportunity to conquer their weaknesses will come in the most traditional of campaign forums: Monday's 90-minute, prime-time debate.
Both campaigns expect a record-setting television audience for the high-stakes showdown, which could help tip the balance in a tight White House race.
The visuals alone will be striking as the candidates step behind their podiums at Hofstra University in suburban New York.
Mrs Clinton will be the first woman to take the stage in a presidential general election debate. Mr Trump has spent years on Americans' television screens as a reality show host, but it can still be jarring to see him at politics' upper echelons.
Six weeks from Election Day, and with advance voting already under way, the opening debate is one of the few opportunities left for the candidates to motivate supporters and sway a narrow band of undecided voters. According to a new Associated Press-Gfk poll, more than 85% of likely voters backing Mrs Clinton or Mr Trump say their minds are completely made up. About 13% said they were undecided.
The candidates' preparation has been a microcosm of their sharply different approaches to politics and presumably, the presidency.
The Democratic nominee has spent weeks with advisers, taking full days away from campaign travel to pour through briefing books, practising to pounce if Mr Trump makes false statements and steeling herself for the possibility that he levels deeply personal attacks.
Long-time Clinton aide Philippe Reines is playing Mr Trump in mock debates.
Former President Bill Clinton has sat in on some sessions, offering advice from his own White House debates.
Mr Trump has eschewed traditional debate preparations, but has held midflight policy discussions with a rotating cast of advisers. He has also spent numerous Sundays batting around ideas with aides.
The Republican businessman's loose approach is potentially risky given that he is new to many policy issues expected to come up during the debate. But advisers contend he will compensate by being quick on his feet and point to his experience at performing under pressure.
"Imagine the practice and the training of 13 years of reality television on The Apprentice and then imagine Hillary's experience reading hundreds of papers," said Newt Gingrich, the former House speaker and a Trump adviser who has been talking through policy with the candidate in recent days.
Mrs Clinton's aides fear Mr Trump will indeed be judged more for his performance than his grasp of the numerous challenges that pass across a president's desk. They've been flummoxed by Mr Trump's ability to sail through the campaign without fleshing out many policy positions and glossing over past statements that he no longer views as politically palatable.
On Friday, the Clinton campaign released 19 pages of what they called Mr Trump's "seven deadly lies", including his false assertion that he opposed the Iraq war from the start.
"Even if he meets some kind of lowered bar of being semi-coherent and not having any outbursts, it's hard to imagine he'll avoid his own propensity for lying," said Brian Fallon, Mrs Clinton's campaign spokesman.
Asked whether Mrs Clinton herself planned to call Mr Trump out in the debate if he tries to lie about his past statements, Mr Fallon said: "I don't think she would let anything like that pass."
People familiar with Mrs Clinton's preparations say she has been working through answers to questions that hit at her lack of trustworthiness in the eyes of many Americans, a problem that has dogged her throughout the campaign.
Supporters cringed during a candidate forum earlier this month when Mrs Clinton was pressed about her email use at the State Department and became defensive, rather than apologising and trying to move on quickly.
Mrs Clinton has debated more than 30 times at the presidential level, including several one-on-one debates with Barack Obama in 2008 and Vermont Senator Bernie Sanders in 2016. But this will be her first presidential debate against a candidate from an opposing party, which Democrats say will give her far more latitude in drawing a contrast and defending herself.
"It's a lot more comfortable running against people in the other party than it is debating in the primary," said Anita Dunn, who worked on debate preparations with Barack Obama. "The differences don't have to be manufactured. The differences exist."
Mr Trump had an uneven record during the Republican debates, sometimes controlling the crowded contests and other times fading into the background. He flipped back and forth between being bombastic and trying to act restrained.
Mr Trump's less-than-restrained side was on display on Saturday as he went on Twitter to criticise Mrs Clinton's decision to ask businessman Mark Cuban - a frequent critic of Mr Trump - to be one of her guests at the debate. The Republican nominee suggested he might put Gennifer Flowers, a woman who had a relationship with Bill Clinton, "right alongside" Mr Cuban.
Mr Trump misspelled Ms Flowers' first name in his original tweet, then sent a corrected version minutes later.