The president said Donald Trump was a threat to hard-earned civil rights.
Barack Obama was speaking at a rally in North Carolina.
Donald Trump said Barack Obama should stop campaigning for Hillary Clinton and focus on running the country.
“The bottom line is, no-one wants four more years of Obama,” the Republican candidate told supporters in Pensacola, Florida.
Donald Trump said Hillary Clinton had become “unhinged” in recent days.
Americans will vote for the candidate they want to see in the White House on November 8, with recent polls showing the race tightening between Hillary Clinton and Donald Trump.
Barack Obama told supporters in the key battleground state of North Carolina: “The fate of the republic rests on your shoulders.
“The fate of the world is teetering and you, North Carolina, are going to have to make sure that we push it in the right direction.
“I am not on the ballot, but I tell you what – fairness is on the ballot; decency is on the ballot; justice is on the ballot; progress is on the ballot; our democracy is on the ballot.”
The FBI is now investigating new emails that may be linked to its probe into Hillary Clinton’s private email server.
FBI chief James Comey has faced a fierce backlash for announcing the move just 11 days before the presidential election.
Earlier, Barack Obama implicitly criticized James Comey over the new inquiry into Hillary Clinton’s email use.
It emerged in March 2015 that Hillary Clinton had been breaking federal rules by operating a private email server while she was secretary of state from 2009-2013.
Hillary Clinton’s lawyers combed through the server and provided the state department with 30,000 work-related emails, but her campaign deleted another 33,000 messages, saying they were personal in nature.
James Comey concluded in July that Hillary Clinton had been “extremely careless” in handling classified information, but there were no grounds for any charges.
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