WASHINGTON — The long-awaited testimony of former Acting Attorney General Sally Yates on former National Security Adviser Michael Flynn offered valuable insight on President Trump’s failure to dismiss the compromised former general until forced to do so by embarrassing press reports, and on Trump’s repeated attempts to shift blame to former President Barack Obama.

Yates, a veteran civil service official who was herself fired by Trump for ordering the Justice Department not to defend in court the new president’s ban on travelers from certain Muslim nations, told the Senate Judiciary Committee that the Trump White House brushed off her warning that Flynn was vulnerable to Russian blackmail.

In her calm and self-controlled appearance, Yates recounted how she had informed White House counsel Donald McGahn that Flynn had lied to Vice President Mike Pence about his conversations with Russian Ambassador Sergey Kislyak and expected the White House to take swift action to remove Flynn.

Instead, she said, McGahn summoned her to his White House office a second time to inquire why she was so concerned that one Trump administration official had lied to another one. She told him that Russian intelligence “likely had proof … that created a compromise situation” wherein Flynn “could be blackmailed.” She told White House officials, she said, “so that they would take action.”

However, nothing was immediately done to remove Flynn as the national security adviser, even after reports that Obama himself had warned Trump of the peril of appointing Flynn to the super-sensitive post. Rather, White House chief of staff Reince Priebus and press secretary Sean Spicer dismissed the warning as a mere “heads-up.” Spicer sought to make Obama culpable by noting that Flynn much earlier had been vetted by the Obama administration in the course of Flynn’s appointment to run the Defense Intelligence Agency, a post from which Obama fired him in 2014.

Other Republicans on the committee challenged Yates on the appropriateness of her refusal as the acting attorney general to defend Trump’s travel ban. Sen. John Cornyn of Texas, after noting he had voted earlier for her confirmation as a deputy attorney general, said he was “enormously disappointed” that she had in effect overruled him on the travel ban, on the grounds it violated the constitutional protection of freedom of religion.

Yates, obviously prepared for the question, reminded Cornyn that one of his colleagues, Jeff Sessions, now the attorney general, pointedly asked in her confirmation hearing if the president asked her to do “something that was unlawful or unconstitutional … or even just that would reflect poorly on the Department of Justice, would I say no? … That’s what I promised you I would do, and that’s what I did.”

When Sen. Ted Cruz of Texas repeated the question, she dispatched it with “I did my job.”

Whatever the ultimate outcome of the Russian interference with the 2016 presidential election and the role of Gen. Flynn’s connections with the Russians, Sally Yates’ testimony that she brought the matter to Trump’s attention has already raised speculation of her political future.

What is clear, though, from Yates’s tenacious determination to stick to her guns as a law enforcement official is that she has already proved her value in that chosen arena.

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Jules Witcover is a nationally syndicated columnist.