Clinton, Trump make their closing arguments

With four days remaining before the election, the White House rivals are speaking in increasingly stark terms about the stakes of the race. Clinton is portraying Trump as someone who doesn't care about minorities and women. Trump, meanwhile, is arguing that Clinton flouts the law and says her administration would be consumed with constant investigations and distracting scandals.

The final get-out-the-vote flurry begins

Neither candidate is making an affirmative case for their own campaign, more comfortable keeping their opponent's flaws in the spotlight.

All the focus at this point is on who will be able to secure the 270 electoral votes needed to capture the presidency. Clinton maintains the advantage, leading by four points in CNN's Poll of Polls. She is also ahead in key swing states such as North Carolina and Pennsylvania. But Trump's campaign senses momentum, cheered by recent polls in some blue-leaning swing states such New Hampshire and Colorado.

Why North Carolina is so important in 2016

Both candidates are focusing on the states that can put them over the finish line. So far, Clinton's travel plans hint at a strategy of shoring up her strongholds to prevent Trump from breaking out while laying multiple roadblocks that would prevent Trump from winning 270 electoral votes.

Clinton can't afford falloff

But she cannot afford any falloff in Democratic turnout from 2012 — and is talking up the chances of a Trump victory to create a sense of urgency among her supporters.

"If Donald Trump were to win this election, we would have a commander in chief who is completely out of his depth and whose ideas are incredibly dangerous," Clinton said Thursday in North Carolina. Trump could "easily insult a foreign leader and start a real war instead of just a Twitter war."

On Friday, Clinton will play defence and head to Detroit to fire up base voters, especially African-Americans. She'll be in Pittsburgh and Philadelphia later on, the epicentres of heavy Democratic votes in Pennsylvania.

Both states are on Trump's lists of possibilities where a breach of Clinton's defensive wall could turn the electoral math on its head.

On Saturday, after a day on the trail elsewhere, Clinton will be back in Philadelphia for a concert with Katy Perry.

Democrats, Trump lawyers going to court early

On Sunday, she'll head to Ohio. She's likely not made her last visits to Florida or North Carolina, states that her campaign is blanketing with high-profile surrogates, including President Barack Obama and former President Bill Clinton.

Should Clinton deprive Trump of Ohio, North Carolina or Florida, she will likely make it all but impossible for Trump to amass 270 electoral votes.

Her campaign will wrap up with a symbolic torch passing rally with Obama and first lady Michelle Obama and Bill Clinton in Philadelphia on Monday night. The event will underscore the symbolism of her historic potential as the possible first female president in the city that nurtured American democracy – and contains a crucial bloc of voters.

As it shores up its electoral position, the Clinton campaign's final message to voters is adding a harsh new twist to a narrative she has been spinning for months — that Trump is simply not fit to be President.

Trump's case

Trump's case about Clinton is no less bleak, underscoring the deeply antagonistic and divisive nature of the campaign.

The billionaire is portraying his foe as an impeachment waiting to happen, expanding on his "Crooked Hillary" theme and seizing on the revived controversy surrounding her private email server to maximise the damage.

"Hillary Clinton has engaged in a massive, far-reaching criminal conduct, and equally far-reaching cover-up," Trump said Thursday in Florida. "She created an illegal e-mail server to shield and guard her activity, so simple, so simple."

Here we go again with Clinton, you remember the impeachment, and the problems?" he continued. "She's likely to be under investigation for many, many years, also likely to conclude in a criminal trial. This is not what we need in this country, folks. We need somebody that's going to go to work to bring our jobs back, to take care of our military, to strengthen up our borders."

Trump is also keeping himself in check, showing unusual discipline. After a campaign in which he has repeatedly undermined his own prospects with volatile behaviour and controversial comments, he's stuck to the script for days.

Can Teleprompter Trump stay disciplined?

But the pressure will be intense in the final days and will represent the ultimate test of Trump's temperament and self control. He has so far announced plans to travel to New Hampshire, Ohio and Pennsylvania on Friday, North Carolina on Saturday and again on Sunday before heading to New Hampshire.

That itinerary suggests Trump is still seeking to secure Ohio, where his blue-collar friendly populist message has him slightly ahead, and must have North Carolina, where he is four points behind Clinton in the CNN Poll of Polls.

Trump's trip to New Hampshire comes after several polls showing a serious narrowing of the race in a state Democrats had banked on Clinton winning.

The Granite State only has four electoral votes but it is part of a sequence of battleground states that Trump needs to win to take the presidency, also including Iowa, Nevada and Colorado — assuming he wins North Carolina, Ohio and Florida.

And the wild race is down to its final weekend.