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Definition of perjury
: the voluntary violation of an oath or vow either by swearing to what is untrue or by omission to do what has been promised under oath : false swearing

He was under oath and they asked hin a question about anyone in the Trump campaign that had any contacts or communications with any Russian officials
He said NO
THEN HE HAD A CHANCE TO GO OVER THE RECORD AND FIX ANY MISTAKES
AND HE DIDN'T
Now he might not have any talks about the election but as of today there are I believe 26 members on that committee and he was the only one who met with Russian officials during the campaign
This is the top law official in the country he voted to impeach Bill Clinton for
Perjury in 1999
What's the difference?
All he had to do when he was under oath was to admit talking to Russian officials and this wouldn't be an issue or when he REVIEWED his record correct it but he chose not to