I am not sure what this source is- probably your own imagination- but the right wing extremist at the NY times itself states Clinton voluntarily testified at the trial. He could have kept the subpoenas until he was done as president but did not.    https://www.google.com/amp/s/www.nytimes.com/2018/05/29/us/politics/clinton-testimony-grand-jury.amp.html
    • Thank you (+1)
    1