Joe Biden promised to lower the temperature of America’s partisan hothouse, but some of his nominations have not lived up to that promise. One that does is his selection of Merrick Garland as Attorney General, perhaps now the most important cabinet post for domestic politics.

Public confidence in the Department of Justice has been severely damaged in recent years, not least the last four, as it became clear that President Trump’s partisan adversaries manipulated the FBI and Justice Department to try to handicap his Administration. Trump toward the end of his term also increasingly demanded that the Justice Department be weaponized in reverse. Attorney General Bill Barr refused and did his best to depoliticize prosecutorial decisions.

The Biden Administration will face pressure from the left to pursue Republicans who worked in the Trump Administration, banana-republic style, along the lines Sen. Elizabeth Warren called for in her presidential campaign. Vice President Kamala Harris said in 2019 she would have “no choice” but to prosecute Trump for obstruction of justice if elected president.

But Garland, the D.C. Circuit Court of Appeals judge whom President Obama unsuccessfully nominated to the Supreme Court in 2016, is unlikely to have signed up for a job of political recrimination. For more than two decades he has been a mainstream center-left judge with a calm temperament and no demonstrated interest in settling scores or legal “Resistance.”

Garland’s experience as a prosecutor during the high-crime 1990s may help balance anti-police sentiment in the Biden administration. His vaunted status among Democrats, who feel he was wronged by the 2016 Republican decision not to seat him on the Supreme Court, might give him more credibility to make decisions that disappoint progressives.

The Biden administration will still be legally liberal, and perhaps aggressively so. It’s not a coincidence that Garland’s selection came a day after the Georgia runoff elections that wrested Senate control from the GOP. Some Democrats worried about their ability to confirm Garland’s replacement on the D.C. Circuit if Republicans kept their majority.

Now the Biden team knows there will be fewer checks on its agenda. Garland also has a record of deferring to executive agencies, which will help him shape and defend the Biden administration’s regulatory approach.

Yet amid explosive partisan tensions, the most important Department of Justice priority is to restore confidence that the federal government’s greatest domestic powers are accountable and not abused for political ends. Biden’s choice of Judge Garland over a more polarizing pick bodes well for his administration.

Today’s editorial is from The Wall Street Journal. The views expressed are not necessarily those of this newspaper.