Eric Holder Jr., the nation’s first black U.S. attorney general, is preparing to announce his resignation  Thursday after a tumultuous tenure marked by civil rights advances, national security threats, reforms to the criminal justice system and five and a half years of fights with Republicans in Congress.

Two sources familiar with the decision tell NPR that Holder, 63, intends to leave the Justice Department as soon as his successor is confirmed, a process that could run through 2014 and even into next year. A former U.S. government official says Holder has been increasingly “adamant” about his desire to leave soon for fear he otherwise could be locked in to stay for much of the rest of President Obama’s second term.

Holder already is one of the longest serving members of the Obama cabinet and ranks as the fourth longest tenured AG in history. Hundreds of employees waited in lines, stacked three rows deep, for his return in early February 2009 to the Justice Department, where he previously worked as a young corruption prosecutor and as deputy attorney general — the second in command — during the Clinton administration.

But some of that early glow faded in part due to the politicized nature of the job and in part because of Holder’s own rhetoric, such as a 2009 Black History Month speech where he said the country was “a nation of cowards” when it comes to discussions about racial tension.

Five years later, violence erupted between police and protesters in Ferguson, Mo., after a white policeman killed an unarmed black 18 year old. And this time, the White House dispatched Holder to speak his piece, in effect jump starting that conversation, and helping to settle nerves in the frayed community.

Another huge controversy — over his decision to try the 9-11 plotters in a New York courthouse in the shadow of the Twin Towers of the World Trade Center — prompted venomous reaction from lawmakers, New York City officials and some victim families.

Under pressure that threatened his job and his legacy, the attorney general reversed his decision and instead sent the cases to military court — where they continue to languish even as Osama Bin Laden’s son-in-law and other terrorism defendants are serving life sentences in maximum security prisons on American soil.

Holder most wants to be remembered for his record on civil rights: refusing to defend a law that defined marriage as between one man and one woman; suing North Carolina and Texas over voting restrictions that disproportionately affect minorities and the elderly; launching 20 investigations of abuses by local police departments; and using his bully pulpit to lobby Congress to reduce prison sentences for non-violent drug crimes. Many of those sentences disproportionately hurt minority communities.

And then, there’s his relationship with Congress. From the day Holder’s nomination was announced, Republicans led by Sen. Mitch McConnell, R-Ky., signaled he would be a political lightning rod.

The attorney general’s portfolio, which spans sensitive law enforcement cases and hot button social issues including marijuana and gay marriage, didn’t help. But even longtime aides say Holder didn’t do enough to help himself by shrugging off preparations and moot sessions before congressional appearances and speaking off the cuff — and obliquely.

Things hit a crisis point when the GOP-led House voted him in contempt for refusing to hand over documents about a gun trafficking scandal known as Fast and Furious. That represented the first time an attorney general had ever been rebuked that way but still Holder held onto his job.

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