Sen. Dianne Feinstein (D-Calif.) in a Senate elevator on Dec. 18. (Bill O'Leary/The Washington Post)

The decision by Sen. Dianne Feinstein (D-Calif.) to release the full transcript of the testimony before the Senate Judiciary Committee by Glenn Simpson of Fusion GPS last August was courageous, patriotic and long overdue.

Last summer, following this interview, Sen. Charles E. Grassley (R-Iowa), when asked by his constituents at a town-hall meeting, said that he saw no reason not to vote for its release. How things have changed since. Mr. Grassley and Sen. Lindsey O. Graham (R-S.C.) now want the Justice Department to open a "criminal investigation" into former British spy Christopher Steele's work for Fusion GPS, apparently because it strikes too close to President Trump's dealings with Russia.

Nothing sheds light on a subject like full disclosure, and in this case it appears to show the hypocrisy of the many Trump protectors among the Republicans, who cherry-picked a few things from the interview to support their bogus request for a criminal investigation of a friend of the United States who was attempting to bring to the attention of the FBI the possibility of blackmail by the Russians.

If the investigating committees of the House and Senate were serious in their search for the truth about how the Russians interfered with our election, they would have welcomed Mr. Simpson's information. Instead, they have been circling the wagons around the White House and the president in an attempt to distract and divert. It is a disgrace made all the more evident by Ms. Feinstein's act of patriotism.

Douglas A. Heydon, Washington