The breaking news about the bombshell book by former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE, which reveals critical evidence about the role of President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE in the Ukraine affair now being debated in the impeachment trial, and Bolton’s concern that Trump might have done special favors for foreign dictators whose political support or money he allegedly might seek, is creating panic among Trump’s GOP supporters in Washington.

It should.

The Bolton bombshell offers firsthand evidence of a hard truth that serious people have long recognized but Trump’s defenders have long denied: that Trump was at the center of a partisan campaign to pressure our democratic ally in Ukraine to announce a bogus investigation against the political opponent he greatly fears, former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE.

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The Bolton bombshell also raises another tantalizing piece of potentially critical information that the media has not yet focused on intensely, but soon will. When Bolton in his book apparently asserts that he fears that Trump has done special favors for foreign dictators whose help he seeks, what information, if any, does he have on this matter, which Congress and the American people do not yet have, about an allegation that could, if proven, constitute a serious abuse of presidential power?

While last week ended with the likelihood that even more moderate Republican senators would surrender to Trump and vote against allowing witnesses into the impeachment trial, the Bolton bombshell makes it virtually impossible for Senate Republicans running in 2020 to vote against witnesses without risking an enormous and potentially decisive political backlash back home.

Even before the Bolton bombshell, who ever heard of a trial without witnesses or evidence?

Who ever heard of a defense of an accused president that argues that abuse of power and obstruction of Congress, even if conclusively proven, are not grounds for action?

Who ever heard of a defense whose most prominent advocates state, again and again, that even if every argument by opposing counsel is conclusively proven, it should not matter a whit to the jury that took an oath to be impartial?

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Who ever heard of a defense in a case before Congress that tries to put the victim of the offense, in this case Trump’s feared opponent Biden, who a list of Trump administration appointees have declared did nothing wrong, on trial, the way criminal lawyers shamefully put the victim of the crime on trial because they cannot effectively argue for the innocence of their client?

If Trump, Attorney General William Barr Bill BarrSunday shows - Ruth Bader Ginsburg's death dominates What Attorney General Barr really said about justice Pelosi: House will use 'every arrow in our quiver' to stop Trump Supreme Court nominee MORE, Secretary of State Mike Pompeo Michael (Mike) Richard PompeoUS reimposes UN sanctions on Iran amid increasing tensions Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Trump steps up Iran fight in final election stretch MORE or others believe that what Bolton alleges is false, they should be given every opportunity to testify about this, under oath as Bolton would be.

In a fair and rational world, in a fair and impartial trial, the Senate would vote to have Chief Justice John Roberts, who the constitution requires to preside over the case, make rulings about which witnesses should testify and which should not. This would be the most fair way to decide the question of witnesses and evidence. While senators would be able to reverse his decisions, my view is that they would be highly unlikely to do so in large numbers.

The Bolton bombshell makes Republicans tremble because it destroys their argument, which is far from true to begin with, that House impeachment managers offered only hearsay evidence. What Bolton offers is, obviously, firsthand evidence from the president’s former national security adviser.

The Bolton bombshell makes Republicans tremble because they fear that Bolton might have material evidence about other abuses of power, involving alleged favors Bolton implies Trump might have done for foreign dictators.

The Bolton bombshell makes Republicans tremble because he makes it impossible for Republican senators to say, with a straight face and clear conscience and credibility with voters, that they do not even want to hear critical witnesses, evidence and facts — about the case which they have sworn to consider with integrity and impartiality — from a staunch conservative and committed Republican.

Budowsky was an aide to former Sen. Lloyd Bentsen (D-Texas) and former Rep. Bill Alexander (D-Ark.), who was chief deputy majority whip of the House of Representatives. He holds an LLM in international financial law from the London School of Economics.