Former U.S. president Barack Obama said the idea that senior Trump advisors are secretly working to undermine the president is not how 'our democracy is supposed to work.'

Barack Obama stepped behind the White House podium for the last time Wednesday, fielding questions from the crush of journalists crammed in for the occasion.

With Hillary Clinton sidelined by pneumonia, U.S. President Barack Obama took up the Democrats' fight against Donald Trump on Tuesday, trying to quash the Republican presidential candidate's bid to appeal to working-class voters.