Or we can refer to Wikipedia in which Clapper’s excuse is (paraphrases) “I forgot” and “they weren’t supposed to ask about something classified” to which Wyden replied “he got the questions in advance so he could tell us not to ask about classified stuff.”
Wyden then asked Clapper, "Does the NSA collect any type of data at all on millions or hundreds of millions of Americans?" He responded, "No, sir." Wyden asked, "It does not?" and Clapper said, "Not wittingly. There are cases where they could inadvertently, perhaps, collect, but not wittingly."
[…]
In Clapper's 2018 memoir, he provides a fuller explanation of the incident:
...because the NSA program under Section 215 was highly classified, Senator Wyden wouldn't or shouldn't have been asking questions that required classified answers on camera....my error had been forgetting about Section 215, but even if I had remembered it, there still would have been no acceptable, unclassified way for me to answer the question in an open hearing. Even my saying, "We'll have to wait for the closed, classified session to discuss this," would have given something away. ...I ought to have sent a classified letter to Senator Wyden explaining my thoughts when I'd answered and that I misunderstood what he was actually asking me about. Yes, I made a mistake – a big one – when I responded, but I did not lie. I answered with truth in what I understood the context of the question to be.
On June 11, U.S. Senator Ron Wyden (D-OR) accused Clapper of not giving a "straight answer," noting that Clapper's office had been provided with the question a day in advance of the hearing and was given the opportunity following Clapper's testimony to amend his response.
> I answered with truth in what I understood the context of the question to be.
I love this quote. I can listen to someone ask me a question, discard what was asked and pretend I was asked another question, then reply to my own imagination.
Clapper wasn't asked a vague question and he didn't answer ambiguously. There is no room for "how incredibly different human perceptions can be". Clapper was asked a direct question in sworn testimony before Congress and brazenly lied. Repeatedly.
That Clapper faced no real consequences for his perjury and his part in violating the Constitution and the rights and privacy of all Americans simply shows how little power Congress and the American people have over the villains and criminals in the intelligence services.
Wyden then asked Clapper, "Does the NSA collect any type of data at all on millions or hundreds of millions of Americans?" He responded, "No, sir." Wyden asked, "It does not?" and Clapper said, "Not wittingly. There are cases where they could inadvertently, perhaps, collect, but not wittingly."
[…]
In Clapper's 2018 memoir, he provides a fuller explanation of the incident:
...because the NSA program under Section 215 was highly classified, Senator Wyden wouldn't or shouldn't have been asking questions that required classified answers on camera....my error had been forgetting about Section 215, but even if I had remembered it, there still would have been no acceptable, unclassified way for me to answer the question in an open hearing. Even my saying, "We'll have to wait for the closed, classified session to discuss this," would have given something away. ...I ought to have sent a classified letter to Senator Wyden explaining my thoughts when I'd answered and that I misunderstood what he was actually asking me about. Yes, I made a mistake – a big one – when I responded, but I did not lie. I answered with truth in what I understood the context of the question to be.
On June 11, U.S. Senator Ron Wyden (D-OR) accused Clapper of not giving a "straight answer," noting that Clapper's office had been provided with the question a day in advance of the hearing and was given the opportunity following Clapper's testimony to amend his response.
https://en.wikipedia.org/wiki/James_Clapper