The Democratic candidate – who has seen her national opinion poll lead shrink in recent days – targeted her Republican rival’s temperament and attitude to women.
Donald Trump said Hillary Clinton would be followed into the White House by criminal investigations.
The New York billionaire has gained ground on Hillary Clinton in some swing states, polls suggest.
On November 3, Melania Trump made a rare campaign appearance in the Philadelphia suburbs.
In her first speech since the GOP convention in July, Melania Trump spoke about being an immigrant and a mother and said her husband would “make America fair”.
Donald Trump’s wife also vowed to lead a campaign against cyber-bullying if she becomes first lady, and to combat a culture that has “gotten too mean and too rough”.
Melania Trump made no reference to her husband’s record of name-calling on social media.
Donald Trump has gained ground on Hillary Clinton in a number of swing states, including Florida and North Carolina, according to polls. Some national tracker polls are now suggesting the two candidates are neck-and-neck.
According to the Reuters/Ipsos States of the Nation project, Hillary Clinton’s odds of winning the necessary 270 Electoral College votes on November 1 at about 90%, down from 95% last week.
The momentum appears to be with Donald Trump, who has joked about having to stay on message, as the final weekend of campaigning approaches.
The Republican candidate has capitalized on a new FBI investigation into a Hillary Clinton aide’s emails.
At a rally in Jacksonville, Florida, Donald Trump’s fourth appearance in the state, he said: “Here we go again with the Clintons – you remember the impeachment and the problems.
“That’s not what we need in our country, folks. We need someone who is ready to go to work.”
Later, at a night-time rally in North Carolina, Donald Trump delivered a speech on defense in which he said he could not imagine Hillary Clinton as commander-in-chief.
Hillary Clinton continued to focus on Donald Trump’s character, telling a rally in North Carolina: “He has spent this entire campaign offering a dog whistle to his most hateful supporters.
“This has never happened to a nominee of a major party.”
The democratic candidate added: “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.”
President Barack Obama has been working almost as hard as Hillary Clinton, as he attempts to rally support among young voters and African Americans.
Analysis of early voting returns suggests black voters may not be turning out in the kinds of numbers they did for Barack Obama in 2012.
Alluding to Donald Trump’s past as a reality TV show host, Barack Obama told students at Florida International University in Miami: “This isn’t a joke. This isn’t Survivor. This isn’t The Bachelorette. This counts.”
Hillary Clinton also got a boost from her one-time rival for the Democratic nomination, Bernie Sanders. He appeared alongside her at a rally in North Carolina on November 3, praising her commitment to increasing the minimum wage and tackling inequality.
Pharrell Williams was also at the event, hailing Hillary Clinton’s record on women’s rights.
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