In November 2017, Harding published
Collusion: Secret Meetings, Dirty Money, and How Russia Helped Donald Trump Win on the subject of
Russian interference in the 2016 United States elections. The book examines the
dossier by former British spy
Christopher Steele, and alleges that
Trump was the subject of at least five years of "cultivation" by Soviet/Russian intelligence services prior to his election, and possibly by the
KGB as soon as 1987. In May 2021, former
The New York Times reporter
Barry Meier published
Spooked: The Trump Dossier, Black Cube, and the Rise of Private Spies, which cited the Steele dossier as a case study in how reporters can be manipulated by private intelligence sources; Meier named Harding and MSNBC's
Rachel Maddow as examples. On 27 November 2018, Harding co-authored an anonymously sourced article for
The Guardian claiming that
Julian Assange and
Paul Manafort met several times at the Ecuadorian embassy in 2013, 2015, and 2016 possibly in relation to the
2016 Democratic National Committee email leak. Manafort and Assange both denied that they had ever met, and Manafort said
The Guardian had "proceeded with this story even after being notified by my representatives that it was false". According to
Glenn Greenwald citing
Tommy Vietor, "if Paul Manafort visited Assange at the Embassy, there would be ample amounts of video and other photographic proof demonstrating that this happened.
The Guardian provides none of that." No other news organization was able to corroborate the story, and according to Paul Farhi of
The Washington Post, "
[T]he Guardian’s bombshell looks as though it could be a dud". Harding describes how, in his view, Trump has made the United States “uniquely vulnerable” to the disinformation techniques employed by the Kremlin. According to David Bond, Harding's
Shadow State also "raises fresh questions about the way the UK government has handled claims of
Kremlin interference in Britain’s democratic processes." In July 2021, Harding,
Julian Borger, and
Dan Sabbagh announced that
The Guardian had received a tranche of secret Russian documents, now known as the "
Kremlin papers", allegedly leaked from the Kremlin. The document, said to have been produced on January 22, 2016, appears to authorize Putin's plan for Russian interference in the 2016 US election on behalf of "mentally unstable" Donald Trump. The document apparently confirms the existence of
kompromat on Trump and matches some incidental details already known about Russian interference. Philip Bump of the
Washington Post was skeptical of the document's veracity because it was "convenient for generating enthusiasm", contains predictions of destabilization that would have been difficult to make in advance, and because the 2016 document contains discussion of "how Russia might insert 'media viruses' into American public life" when these efforts had in fact been underway since at least 2014. Experts on Russian disinformation and propaganda encouraged caution. ==Russian invasion of Ukraine==