Separately, Mr Obama said that the political climate was "infecting" communities with a politics of fear consigned to a past era.
It is common practice for former presidents to hold back criticism of the person now holding office.
"What we can't have is the same old politics of division that we have seen so many times before, that dates back centuries", Mr Obama told a cheering crowd in Newark, New Jersey, that chanted: "Four more years".
"We've got folks who are deliberately trying to make folks angry, to demonize people who have different ideas, to get the base all riled up because it provides a short-term tactical advantage", Mr. Obama said.
"We thought we put that to bed". I mean, that's folks looking 50 years back.
Also Thursday, appearing before a packed room in New York, Mr. "At times, it could seem like the forces pulling us apart are stronger than the forces binding us together".
"We've seen nationalism distorted into nativism - forgetting the dynamism that immigration has always brought to America", Bush said, noting: "We see a fading confidence in the value of free markets and global trade - forgetting that conflict, instability, and poverty follow in the wake of protectionism". Bush said, adding, "We've seen nationalism distorted into nativism..."
While media outlets and television talking heads were quick to applaud former President George W. Bush's implicit rebuke of Trumpism in a rare political address delivered in NY on Thursday, many critics dissented from the chorus of applause, calling the speech "hypocritical bullshit" and highlighting Bush's long list of offenses that includes wars in Iraq and Afghanistan, the Patriot Act, an overseas torture regime, and "heinous" treatment of Muslims at home and abroad.
On Thursday 19/10/2017, Prior president George W. Bush delivered a Rare Political speech which was an indirect harsh criticism against President Donald Trump's inharmonious style of leadership where he has warned of threats to American democracy and a deterioration of civic engagement.
Bush may now be denouncing the "conspiracy theories and outright fabrication" of the present moment, but "the war in Iraq, which destabilized the region, killed hundreds of thousands, and helped give rise to ISIS was predicted on intelligence that Bush's administration misrepresented to the American people", Peyser observes.
When asked if Mr.
"The themes president Bush spoke about today are really the same themes he has spoken about for the last two decades", said Bush spokesman Freddy Ford.
In a video published by CNN, Bannon suggests Bush hadn't understood what his "high-falutin'" comments, written by a speech writer, had actually meant.
As he left the hall, Mr.