Democratic senator to force vote requiring Roberts to weigh in on witnesses

 
The move comes as GOP senators are increasingly confident they will have the votes to block witnesses from being called. 
 
If Democrats are able to muster four GOP votes to allow witnesses, both sides could then make motions for specific individuals and documents. Under the rules resolution, the Senate would vote on the motions. 
 
But Van Hollen's effort would let Roberts issue subpoenas if he thinks a motion is relevant. The Senate, if it disagreed with his decision, could still overrule him with a simple majority. 
 
"A fair trial includes relevant documents and witnesses. And in a fair trial the judge determines what evidence is admitted," Van Hollen said in a statement. "My motion ensures the Chief Justice will serve the same role as a judge in any trial across our country – to allow the Senate access to the facts they need to get to the truth."
 
The motion, according to text from Van Hollen's office, would require Roberts to issue subpoenas for witnesses or documents requested by either side if he "deems them likely to have probative evidence relevant to either article of impeachment."
  
Van Hollen would also require Roberts to referee any claims of executive privilege. 
 
Democrats want to subpoena four witnesses, including former national security adviser John BoltonJohn BoltonHave the courage to recognize Taiwan McConnell says Obama administration 'did leave behind' pandemic plan Trump company lawyer warned Michael Cohen not to write 'tell-all' book: report MORE and acting chief of staff Mick MulvaneyMick Mulvaney12 things to know today about coronavirus Mulvaney: 'We've overreacted a little bit' to coronavirus The Memo: Trump agenda rolls on amid pandemic MORE. President TrumpDonald John TrumpDonald Trump and Joe Biden create different narratives for the election The hollowing out of the CDC Poll: Biden widens lead over Trump to 10 points MORE is likely to invoke executive privilege on both to prevent them from testifying if they were subpoenaed by the Senate.  
 
“No Republican can question the fairness of this approach – the Chief Justice oversees the highest court in our land and was nominated by a Republican President. And, given his authority to rule on questions of privilege, they should not fear a drawn-out process," Van Hollen said. 
 
"I urge my colleagues to seek out the truth and the facts and to vote in support of my motion. Anything else constitutes an effort to hide the truth," he added. 
 
The plan to force a vote on Friday comes after Democrats tried to get similar language included in the rules resolution passed last week. Their effort was rejected along party lines. 
 
Roberts has, so far, largely taken a backseat in the impeachment proceeding. 
 
With several GOP senators still undecided on calling witnesses, a 50-50 tie still remains open as one possibility; however, GOP senators say they do not expect Roberts would step in and break the tie. 
 
If he were to break a tie and side with Democrats, Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellFor city parks: Pass the Great American Outdoors Act now US ill-prepared for coronavirus-fueled mental health crisis Schumer to GOP: Cancel 'conspiracy hearings' on origins of Russia probe MORE (R-Ky.) could only afford to lose two GOP votes in order to still have the 51 votes to block witnesses. If there was a tie and Roberts did not cast a vote, McConnell could lose three GOP senators because a tied vote would be the same as the witness vote failing. 

“I certainly think it’s a very fraught topic,” Sen. Josh HawleyJoshua (Josh) David HawleyExpanding tax credit for businesses retaining workers gains bipartisan support GOP deeply divided over Trump's social media crackdown Trump's social media executive order is a huge opportunity MORE (R-Mo.) said on Wednesday. “I would guess that he would not break a tie.”