[TruthWillWin]

Timing is significant, (Mark Z criminal referral for lying to Congress), @Jack is appearing before congress in a few days.

May force him to take the 5th, or is that allowable during testimony to Congress?

[Richard Kimball]

Emergency backup Bagster here:

Are you here for Festival?

May force him to take the 5th, or is that allowable during testimony to Congress?

Not a lawyer, but I think you can take the fifth anytime you're under oath, with a few exceptions. The only times I'm aware of that you CAN'T take the fifth is if you've been granted immunity on the subject or if you've willingly taken the stand as a defendant in a criminal case.