(Reposted article excerpt:) "...In his book, Mr. Bolton writes that Mr. Trump told him in August that he wanted to continue freezing $391 million in congressionally approved security assistance to Ukraine until its government helped with investigations into Democrats including former Vice President Joseph R. Biden Jr. and his son Hunter Biden — exactly what Mr. Trump is on trial for.."

(Commentary, including reposted material. Temporarily posted.)

(Post's title:) Source news analysis article link. No affiliation, subscription may be needed:

"John Bolton’s Account Upends Trump’s Denials, but Will It Upend Trump?"

Additional excerpt:

"...Mr. Bolton is a hard witness for Mr. Trump to simply brush off. He is no liberal Democrat or deep-state bureaucrat, nor is he even a Never Trump Republican, but a conservative hawk with years of credibility among Republicans and a strong following from his days as ambassador to the United Nations and Fox News commentator. He spent 17 months as Mr. Trump’s national security adviser and knows a lot about what happened on the inside during that time."

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(Comment:) Please contact Republican senators and 'demand' (or 'request') that they support (votes for) pertinent witnesses and documents in Donald Trump's Senate impeachment trial!

Also: ↓For additional consideration.. (1/27/20 opinion article link, subscription):

"John Roberts Can Call Witnesses to Trump’s Trial. Will He?"

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(Copies, no affilation:)

The @NYTimes report suggests multiple top Trump Admin officials knew the facts and deliberately misled Congress and the American people.

A massive White House cover-up.

All we need is four Republican Senators to get the truth.https://t.co/JbazBaYdRU

— Chuck Schumer (@SenSchumer) January 27, 2020

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There is no pretense left. There are no excuses remaining.

Now, with Bolton ready to definitely confirm Trump’s high crime, every Republican who refuses to hear his testimony lands a potentially mortal blow to the rule of law in America. https://t.co/h2EK5kI6SM

— Chris Murphy (@ChrisMurphyCT) January 27, 2020

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Amb. Bolton reportedly heard directly from Trump that aid for Ukraine was tied to political investigations.

The refusal of the Senate to call for him, other relevant witnesses, and documents is now even more indefensible.

The choice is clear: our Constitution, or a cover-up. https://t.co/HBW82ObvOl

— Nancy Pelosi (@SpeakerPelosi) January 27, 2020