The Office of the Director of National Intelligence (ODNI) has not endorsed a CIA assessment that concluded Russia intervened in the U.S. presidential race to help Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE win the presidency, Reuters reported.

The ODNI, which oversees the 17 agency-strong U.S. intelligence community, believes there is not conclusive evidence Russia was looking to help Trump, three American officials told Reuters.

"ODNI is not arguing that the agency (CIA) is wrong, only that they can't prove intent," said one of the three U.S. officials.

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"Of course they can't, absent agents in on the decision-making in Moscow."

The officials told Reuters the FBI declined to accept the CIA assessment for the same reasons.

One of the officials said the CIA conclusion was a "judgment based on the fact that Russian entities hacked both Democrats and Republicans and only the Democratic information was leaked."

"(It was) a thin reed upon which to base an analytical judgment," the official added.

The president-elect has strongly rebuked the CIA assessment, calling it "ridiculous" that Russia would intervene to help him win.

During an interview Sunday, Trump said he thinks it's just "another excuse," adding he doesn't "believe it."

A group of bipartisan senators on Sunday called for a congressional investigation into the matter, and have been pushing for the investigation over the past few days.

In a statement, the group of senators said Russian interference in the election should "alarm every American," adding that the recent cyberattacks "have cut to the heart of our free society."

On Monday, House Intelligence Committee Chairman Devin Nunes (R-Ky.) rejected bipartisan calls for his panel to open a new investigation into the matter. In a statement, he argued that new probes "would duplicate" his committee's efforts and pointed to its "vigorous oversight" of current investigations into cyber attacks connected to the campaign.