Shut it down. But punish those who have been abusing it. I suspect the Trump case is not the first one; they just made the mistake of going after a president.
Meanwhile, Carter Page is suing the DNC over the dossier. Perkins Coie hasn’t gotten enough attention. I hope that’s about to change.
If they insist on witnesses, I want to see Schiff on the stand, under oath.
[Update a few minutes later]
Someone on an email list I’m on questioned whether or not it would be permissible to force an impeachment manager on the stand. I see no reason why not; the Senate makes the rules.