Neal K. Katyal, Joshua A. Geltzer and Mickey Edwards write:

An overwhelming number of Americans, including a majority of Republicans, believe the Senate should hear from relevant witnesses and obtain documents during President Trump’s impeachment trial. Striking new revelations about the president’s role in the Ukraine affair, as reported from an unpublished manuscript by John Bolton, underscore the need for his testimony and that of others.

Yet Republican members of the Senate have signaled that they intend to uphold Mr. Trump’s unprecedented decision to block all of this material.

But turns out they don’t get to make that choice — Chief Justice John Roberts does. This isn’t a matter of Democrats needing four “moderate” Republicans to vote for subpoenas and witnesses, as the Trump lawyers have been claiming. Rather, the impeachment rules, like all trial systems, put a large thumb on the scale of issuing subpoenas and place that power within the authority of the judge, in this case the chief justice.

Most critically, it would take a two-thirds vote — not a majority — of the Senate to overrule that. [Continue reading…]