Former FBI Director James Comey testified on Thursday that he kept personal memos about his interactions with President Trump because he suspected the president might lie about their encounters.

Sen. Mark Warner Mark Robert WarnerFBI director casts doubt on concerns over mail-in voting fraud Democrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits MORE (D-Va.) asked Comey during a Senate Intelligence Committee hearing why he kept personal memos about his meetings with Trump.

“The nature of the person,” Comey said. “I was honestly concerned he might lie about the nature of our meeting, so I thought it really important to document.”

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Comey said he didn’t have to do the same thing with former presidents George W. Bush and Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE.

“I knew there might come a day when I might need a record of what happens, not only to defend myself but to defend the FBI and our integrity as an institution and the independent investigative function,” Comey said. “That's what made this so difficult.”

Read more from The Hill:

Live coverage: Comey testifies before Senate Intelligence Committee