I Led the F.B.I. Mueller Is Just Doing His Job.

Robert Mueller in 2004, when he was the F.B.I. director, a position that the author, William Webster, once held.

In 1978, I was asked to head the F.B.I. at a perilous time. The bureau was mired incontroversy, stung by criticism over Watergate and warrantless wiretaps, beleaguered by congressional investigations. I took on the job because, as I said back then, “this institution was too important to lose.”

We worked hard to restore trust.Ronald Reagan later appointed me to do the same at the C.I.A. after the Iran-contra scandal. Having served my country through these challenging chapters in American history, I am saddened by what I see happening today to the investigation led by the special counsel, Robert Mueller. From President Trump’s tweets to broadsides from his lawyer, Rudolph Giuliani, denouncingthe investigation, to calls from congressional Republicans for the ouster of Mr. Mueller’s boss, Rod Rosenstein, the deputy attorney general, it’s destructive.

I was disappointed to see Mr.Trump this week appear to express greater confidence in the word of President Vladimir Putin of Russia than in the unanimous judgment of the men and women of America’s intelligence community, whom I once led. Faith in the justice system and in our intelligence agencies cannot be collateral damage in a partisan grudge match. No matter which party wins, America loses; trust in the rule of law is always too important to lose. Sixty years ago, I was just one of many young Americans who enlisted and put on a uniform to defend America’s values in the world; today, we must defend those values here at home.

I’m a lifelong Republican. Mr. Giuliani was a fine federal prosecutor during the years I led the F.B.I. It is because he knows better that I expect him to do better than to demand that the Justice Department shut down an investigation into possible Russian interference in the 2016 election. That investigation has already led to 35 indictments — including those last weekof 12 Russian intelligence officersin the hacking of the Democratic National Committee and the Hillary Clinton presidential campaign — as well as five guilty pleas and one prison sentence. To accuse Mr. Mueller of trying “to frame” Mr.Trump is wrong.

Mr. Mueller’s service to country should not require defending. Leading the criminal division of the Department of Justice underGeorge H. W. Bush, he shut down the illegal bank that laundered Osama bin Laden’s blood money. UnderGeorge W. Bush, after Sept. 11, Mr. Mueller led the F.B.I. through one of the most difficult times in our nation’s history. As mayor of New York, Mr. Giuliani himself stood with Mr. Mueller in the rubble of the World Trade Center.

Mr. Mueller, a former Marine and decorated Vietnam combat veteran, wasunanimously confirmed twice by the Senate to run the F.B.I. He’s a no-nonsense prosecutor with unquestioned integrity who calls balls and strikes devoid of ideology. Lest anyone wonder, he is of the same political party as the president and the majority in Congress. These are facts, and as John Adams once said, “Facts are stubborn things.”

Most important, I worry where today’s rhetorictakes America. I’ve been very proud to serve as a United States attorney and as a federal judge. I saw firsthand how important it is that average Americans trust that justice is delivered with fairness and impartiality. America works when we can all put our faith in a common set of facts and know that committed public servants are determined to find them.

Americans need to know that we are all still united in the pursuit of justice. We should not run down our own institutions, trivialize the impartial actions of our own grand juries, degrade our own justice system, or bully a free press for doing its job. We do so at our peril. The president should want this investigation to follow the facts where they lead and bring America the answers we all deserve.

I’ve humbly served my country all of my adult life. The proudest title I’ve ever held is one Americans share: citizen. In times like these, citizens have a duty — to serve, and to speak up. Robert Mueller is doing his duty. We need to do ours. When I was sworn in as director of the F.B.I., I said we would “do the work the American people expect of us in the way the Constitution demands of us.” That means defending values like truth, justice and civility, because the idea of an America united by the rule of law istoo important to lose.

William Webster, a former federal judge, was director of the F.B.I. from 1978 to 1987, and director of the C.I.A. from 1987 to 1991.

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