Senator Pat Toomey, When Will He See The Need To Subpoena Bolton?

A few days ago, Pennsylvania Senator Pat Toomey discussed the criteria needed to call witnesses in the impeachment trial of Donald J Trump:

But his bar for allowing any outside testimony remains as high as his bar for removing a president from office. He doesn’t see an “automatic presumption” that there must be witnesses in the impeachment trial, arguing that hearing from those individuals should be used to resolve any key disputed facts.

“The criteria is not, does the witness have something interesting to say,” Toomey told Pennsylvania reporters during an interview Friday morning in his Capitol Hill office. “The criteria is, are they likely to be able to shed definitive light on a disputed issue that is so central to this case that the resolution of it could change my final conclusion?”

He also complained that the House managers, while praising their organization and discipline, were "highly repetitive."

This weekend, the New York Times published this:

President Trump told his national security adviser in August that he wanted to continue freezing $391 million in security assistance to Ukraine until officials there helped with investigations into Democrats including the Bidens, according to an unpublished manuscript by the former adviser, John R. Bolton.

The president’s statement as described by Mr. Bolton could undercut a key element of his impeachment defense: that the holdup in aid was separate from Mr. Trump’s requests that Ukraine announce investigations into his perceived enemies, including former Vice President Joseph R. Biden Jr. and his son Hunter Biden, who had worked for a Ukrainian energy firm while his father was in office.

The Washington Post also reported this weekend that:

Charles Cooper, a lawyer for Bolton, said he submitted the manuscript to the National Security Council’s records management division on Dec. 30 for a standard review process to examine potentially classified information. Cooper said they believed that the book manuscript did not include any classified material and that its contents would not be shared with officials outside that review process.

December 30 is twelve days after the House vote to impeach Trump. The night of that vote, Senator Mitch McConnell said this on Fox "News":

Everything I do during this, I’m coordinating with White House Counsel. There will be no difference between the President’s position and our position as to how to handle this[.]

Senator Toomey, is this enough for you?  Here's a witness (former National Security Advisor John Bolton, a first-hand, eye-witness) who can shed light on a key element of Trump's defense: that the decision to uphold the aid was separate from Mr. Trump’s requests that Ukraine announce investigations into the Bidens.

Don't you think he should be heard by the full Senate?

Since Majority Leader McConnell has stated that there's no difference between his position and the White House's position on dealing with the impeachment trial, does this mean that Trump's defense team has had access to the contents of Bolton's book, especially since Trump has already gloated that they "have all the material"? 

How can this possibly be the "impartial justice" you took an oath to uphold?

I'm asking as a constituent.