President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Monday cast doubt on the secret CIA assessment that concluded Russia intervened in the U.S. presidential election to help him win the White House.

"Can you imagine if the election results were the opposite and WE tried to play the Russia/CIA card," Trump tweeted Monday.

"It would be called conspiracy theory!"

Can you imagine if the election results were the opposite and WE tried to play the Russia/CIA card. It would be called conspiracy theory! — Donald J. Trump (@realDonaldTrump) December 12, 2016

Trump in a subsequent tweet said it is very difficult to determine who is responsible for hacks unless you catch them "in the act."

"Why wasn't this brought up before the election?" he asked.

Unless you catch "hackers" in the act, it is very hard to determine who was doing the hacking. Why wasn't this brought up before election? — Donald J. Trump (@realDonaldTrump) December 12, 2016

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The CIA assessment was first reported by The Washington Post Friday.

Trump and his top aides have since pushed back against the new information. The president-elect on Sunday called the idea that Russia interfered to help him win "ridiculous."