(CNN) In the first hour of former FBI Director James Comey's testimony on Capitol Hill about the nature and details of his relationship with President Donald Trump, he called the president a liar twice.

In his opening remarks, Comey flashed anger at Trump's characterization of him as unpopular among the rank and file of the FBI as well as the idea that the bureau was disorganized and chaotic.

"Those were lies. Plain and simple," Comey said flatly.

Then, when asked by Intelligence Committee Vice Chairman Mark Warner (D-Va.) why he felt the need to document his meetings with Trump when he didn't do the same with past presidents, Comey responded: "I was honestly concerned he might lie about the nature of our meeting."

In the second hour of the hearings and while under questioning from Maine Sen. Angus King (I), Comey directly disputed three more claims by Trump:

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