In 2005, Frum faced a libel lawsuit filed by the Canadian chapter of the Council on American–Islamic Relations after he suggested in a column for the National Post that CAIR was sympathetic to terrorists.
Frum first vowed to fight the lawsuit, but instead the paper published an editor's note acknowledging that "neither Sheema Khan nor the Council on American-Islamic Relations Canada advocates or promotes terrorism."

On October 11, 2007, Frum announced on his blog that he was joining Rudolph Giuliani's presidential campaign as a senior foreign policy adviser.

On November 16, 2008, The New York Times reported that Frum would be leaving National Review, where he was a contributing editor and online blogger.
Frum announced to readers of his blog that he would be starting a new political website, NewMajority.com, describing it as "a group blog, featuring many different voices.
Not all of them … conservatives or Republicans."
He hoped the site would "create an online community that will be exciting and appealing to younger readers, a generation often repelled by today's mainstream conservatism."
The website was launched on January 19, 2009.
On October 31, 2009, its title was changed to FrumForum, to avoid confusion with other political organizations that used "New Majority" in their names.
In 2012 it was merged into The Daily Beast, where his blog continued.
Citing personal reasons shortly after the deaths of his father and father-in-law, Frum suspended his blog on June 3, 2013 but resumed writing for The Daily Beast in September 2013.

Frum joined The Atlantic as a senior editor in March 2014.
During the 2014 Israel–Gaza conflict, Frum issued a series of tweets labeling as "fake" a photo of two blood-covered Palestinian youths bringing their father's body to a hospital in Khan Younis; the man had been killed in an Israeli airstrike.
Frum apologized on The Atlantic.
Frum was criticized by Washington Post media writer Erik Wemple and by fellow correspondent for The Atlantic, James Fallows, who termed Frum's tweets "a major journalistic error."

On November 2, 2016, he announced that he had voted for Hillary Clinton for President.
In 2005, Frum faced a libel lawsuit filed by the Canadian chapter of the Council on American–Islamic Relations after he suggested in a column for the National Post that CAIR was sympathetic to terrorists. Frum first vowed to fight the lawsuit, but instead the paper published an editor's note acknowledging that "neither Sheema Khan nor the Council on American-Islamic Relations Canada advocates or promotes terrorism."
On October 11, 2007, Frum announced on his blog that he was joining Rudolph Giuliani's presidential campaign as a senior foreign policy adviser.
On November 16, 2008, The New York Times reported that Frum would be leaving National Review, where he was a contributing editor and online blogger. Frum announced to readers of his blog that he would be starting a new political website, NewMajority.com, describing it as "a group blog, featuring many different voices. Not all of them … conservatives or Republicans." He hoped the site would "create an online community that will be exciting and appealing to younger readers, a generation often repelled by today's mainstream conservatism." The website was launched on January 19, 2009. On October 31, 2009, its title was changed to FrumForum, to avoid confusion with other political organizations that used "New Majority" in their names. In 2012 it was merged into The Daily Beast, where his blog continued. Citing personal reasons shortly after the deaths of his father and father-in-law, Frum suspended his blog on June 3, 2013 but resumed writing for The Daily Beast in September 2013.
Frum joined The Atlantic as a senior editor in March 2014. During the 2014 Israel–Gaza conflict, Frum issued a series of tweets labeling as "fake" a photo of two blood-covered Palestinian youths bringing their father's body to a hospital in Khan Younis; the man had been killed in an Israeli airstrike. Frum apologized on The Atlantic. Frum was criticized by Washington Post media writer Erik Wemple and by fellow correspondent for The Atlantic, James Fallows, who termed Frum's tweets "a major journalistic error."
On November 2, 2016, he announced that he had voted for Hillary Clinton for President.
David Frum