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Re:Ninth Circuit rules NSA's bulk collection of Americans' c... by alasdair_ on Wednesday September 02, 2020 @10:38PM (#24360352)
A federal court issues the actual order to appear, after 2/3 of a committee or a majority of the house or senate votes to compel a witness to attend.

The witness cannot plead the fifth but they also cannot be prosecuted for anything they say.

And yes 2/3 of a committee is a small number of people.

Re:Ninth Circuit rules NSA's bulk collection of Americans' c... by ncmncm on Wednesday September 02, 2020 @11:53PM (#24360677)
Usually the deal is supposed to be void if they turn out to have lied or concealed relevant information.