The former US president will appear over video, and is set to skewer Mr Trump’s presidency. Mr Obama’s appearance at the convention will also see him throw support behind his former vice president and Democrat nominee Joe Biden. His message will attempt to galvanise support for Mr Biden ahead of the November 3 election.
The former president will pledge Mr Biden will lead the US “out of dark times” caused by Mr Trump’s presidency.
Calling Mr Biden his “friend” and “brother”, Mr Obama will savage Mr Trump’s time in office.
In a strong condemnation of Mr Trump, he plans to say: “He’s shown no interest in putting in the work, no interest in finding common ground, no interest in using the awesome power of his office to help anyone but himself and his friends.
“No interest in treating the presidency as anything but one more reality show that he can use to get the attention he craves.”
Barack Obama news: Former POTUS will savage Donald Trump and back former VP Joe Biden
Joe Biden was praised by Mr Obama as being the candidate to lead the US ‘out of dark times’
Mr Obama will also praise Mr Biden’s record as his vice president.
He will make the remarks from the Museum of the American Revolution in Philadelphia, Pennsylvania, and praise Mr Biden as a good leader and man.
Mr Obama will add: “Twelve years ago, when I began my search for a vice president, I didn’t know I’d end up finding a brother.
“Joe and I came from different places and different generations.
“But what I quickly came to admire about him is his resilience, born of too much struggle; his empathy, born of too much grief.”
Donald Trump took over from Mr Obama in 2016, and was attacked by him for failing to grow into the role
Mr Trump has responded to the comments, claiming he is president because Mr Obama ‘did not do a good job’
Focusing again on Mr Trump, Mr Obama will then also admit he never expected the Republican president to carry on his administration’s policies.
He will then share his wife Michelle Obama’s assessment of the president, and attack Mr Trump for not “growing into the job”.
Mr Obama will continue: “The consequences of that failure are severe. 170,000 Americans dead. Millions of jobs gone.
“Our worst impulses unleashed, our proud reputation around the world badly diminished, and our democratic institutions threatened like never before.”
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Mr Trump has already rebuking Mr Obama’s attacks, and said if his predecessor did a better job he would not have run.
He added at a press conference: “President Obama did not do a good job.
“And the reason I’m here is because of President Obama and Joe Biden, because if they did a good job, I wouldn’t be here.
“Probably if they did a good job I wouldn’t have even run. I would have been very happy.
“I enjoyed my previous life very much, but they did such a bad job that I stand before you as president.”
Mr Biden secured his nomination at the DNC ahead of the November 3 election
Mr Biden has been tipped by polls to dominate Mr Trump in the US election
Mr Obama’s comments are the latest stinging attacks coming from the Democrat National Convention.
Mrs Obama accused Mr Trump yesterday of failing to “meet the moment” throughout his presidency.
Former president Bill Clinton also weighed in, and savaged Mr Trump for only “spending hours a day watching TV and zapping people on social media”.
Hillary Clinton, Democrat nominee for president in 2016, will also urge Democrats to vote for Mr Biden as their “lives and livelihoods are on the line”.