Former Director of National Intelligence James Clapper James Robert ClapperOn China, Biden is no Nixon — and no Trump The Hill's 12:30 Report - Speculation over Biden's running mate announcement Trump slams former intelligence officials to explain 'reluctance to embrace' agencies MORE says it's getting more difficult for him to believe that President 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 didn't know about at least some of his campaign's contacts with Russians during the 2016 presidential election.

"With each subsequent revelation of yet another meeting between someone from the Trump camp and Russians, it gets harder and harder to believe that he didn't know about at least some of them," Clapper told CNN's Wolf Blitzer on "The Situation Room" Monday. "Just statistically, it's illogical. ... It's difficult for me to believe that he didn't know about some of these meetings."

Clapper's comments come after it was revealed this week that former Trump campaign adviser Roger Stone met with a Russian man ahead of the 2016 election who offered dirt on Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE in exchange for $2 million from Trump.

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Clapper said the revelation fell into a pattern of contacts between the Trump campaign and Russia, similar to the famous Trump Tower meeting in June of 2016.

"A major objective of the Russians was to disparage Hillary Clinton and her campaign, so this comports exactly with yet another way the Russians can do that," he said. "The Russians were trying to gain access, leverage to the campaign, and presumably exert influence."

Clapper has clashed with Trump in recent days, often speaking out against the president's comments on the intelligence community.