CIA Director John Brennan at a session at the Intelligence and National Security Summit in Washington. Thomson Reuters The CIA and the FBI seemingly can't agree over why Russian hackers targeted the inboxes of prominent Democrats and Democratic organizations in 2016.

In a secret assessment — the content of which has been leaked to the press via high-level officials briefed on the intelligence — the CIA said the Russians were working toward a specific goal: "to help get Trump elected."

The assessment said Russia was not just trying to undermine confidence in the US election process when it hacked into the emails of Hillary Clinton's campaign chairman, John Podesta, and the Democratic National Committee.

"It is the assessment of the intelligence community that Russia's goal here was to favor one candidate over the other, to help Trump get elected," a senior US official briefed on the CIA report told The Washington Post. "That's the consensus view."

White House press secretary Josh Earnest came close to echoing the CIA's assessment on Monday: “You didn’t need a security clearance to figure out who benefited from malicious Russian cyber activity,” he told reporters during a press briefing.

The FBI, however — while agreeing that the hacking campaign originated in Russia — has been reluctant to align itself with the CIA and assign a motive to the cyberattacks. A senior FBI counterintelligence told the House Intelligence Committee last week that the bureau was still not sure whether Russia's "specific goal" was to get Trump elected.

"There's no question that [the Russians'] efforts went one way, but it's not clear that they have a specific goal or mix of related goals," a US official present at the hearing said.

The CIA report said the Russians had also breached the Republican National Committee but chose not to release any of the information, lending credence to the idea that the Kremlin made a specific and targeted effort to embarrass Democrats.

US President Barack Obama with Russian President Vladimir Putin at the APEC Economic Leaders' Meeting in Lima, Peru, on November 20. REUTERS/Kevin Lamarque This summer, the leak of internal Democratic National Committee email correspondences revealing a bias against Democratic presidential candidate Bernie Sanders — by WikiLeaks, an organization founded by Julian Assange — divided the American left and led to the resignation of the DNC chair Debbie Wasserman Schultz.

The FBI has not yet said whether the RNC was targeted. Reince Priebus, the chair of the RNC and incoming White House chief of staff, denied that the committee had been hacked.

The FBI has gone after Russian hackers before, The New York Times has reported. But because it is a law-enforcement agency, it is required to produce more concrete evidence of criminal wrongdoing than the CIA, which is tasked with producing intelligence analyses.

Even so, Democrats at last week's hearing were apparently frustrated by the FBI official's reluctance to say that the hacking campaign had been designed to hurt Clinton and boost Trump.

The bureau — which was accused of meddling in the election after informing Congress weeks before the election that it was reviewing new Clinton emails found on disgraced former congressman Anthony Weiner's laptop — is apparently exercising caution in drawing conclusions that could be politicized.

On Monday, outgoing Senate Minority Leader Harry Reid criticized FBI Director James Comey for not taking a stronger stance against the Russian meddling ahead of the election.

"They ignored it," the Nevada Democrat told CNN, referring to the letter he sent to Comey before Election Day regarding Russia's cybercampaign. "The FBI director didn't have the decency, the courtesy, to even respond to my letter."

Putin arriving for a meeting on the sidelines of the Russia-ASEAN summit in Sochi, Russia, on May 20. Reuters

Podesta, Clinton's campaign chair whose emails were hacked and leaked, said Monday that the Clinton campaign would support a recent request made by members of the Electoral College to receive an intelligence briefing on the ties between Trump and Russia.

"Our campaign decried the interference of Russia in our campaign and its evident goal of hurting our campaign to aid Donald Trump," Podesta said in a statement first reported by Politico. "We now know that the CIA has determined Russia's interference in our elections was for the purpose of electing Donald Trump. This should distress every American."

Republicans seemed to agree with the FBI official's assessment, however, that the CIA lacked evidence when it told a Senate panel last week that the Russians clearly preferred Trump to Clinton — and tried to damage the Democrats' reputation accordingly.

"Republicans are from Mars, Democrats are from Venus," a Republican lawmaker said during the hearing, according to an aide who was present. "We're looking at the same evidence and drawing very different conclusions."

President Barack Obama has since ordered the intelligence community to conduct a full review into the Russian hacking campaign and how it may have affected the presidential election.

The CIA's assessment came two months after the US intelligence community first accused the Russian government of orchestrating a series of cyberattacks on US citizens and political organizations, stating that "only Russia's senior-most officials could have authorized these activities."

"The US Intelligence Community (USIC) is confident that the Russian Government directed the recent compromises of e-mails from US persons and institutions, including from US political organizations," the Department of Homeland Security and the Office of the Director of National Intelligence said in a statement at the time.

The CIA, meanwhile, waited until after the election to put forward its independent assessment of Russian meddling.

President-elect Donald Trump at a rally in Grand Rapids, Michigan, on Friday. REUTERS/Mike Segar

Trump has extensively criticized the CIA report, saying the agency has no proof that the hacking originated in Russia. On Monday, he suggested that if he had lost the election and blamed it on a Russian initiative, he would be accused of promoting a conspiracy theory.

Russia's fingerprints were all over the cyberattacks, cybersecurity officials concluded in the days and weeks after the breaches. But it has been difficult to prove that Moscow specifically ordered hackers to attack Podesta and the DNC. The hackers were apparently middlemen, rather than Kremlin employees.

It is unclear what the US government will do to retaliate against Russia. The Obama administration has been weighing various measures, from sanctions to authorizing covert action against computer servers in Russia, The New York Times reported. But Obama has yet to sign off on anything concrete.