Judge Merrick Garland's confirmation hearing for his nomination as the nation's next attorney general is now underway in front of the Senate Judiciary Committee. Garland is expected to face tough questions on everything from combating the nation's domestic terror crisis in the wake of the Jan. 6 insurrection, calls for racial justice and equity in the criminal justice system, restoring the department's independence and how he'll handle politically-sensitive investigations into President Joe Biden's son Hunter and special counsel John Durham's probe into the origins of the Russia investigation. 

"The President nominates the Attorney General to be the lawyer -- not for any individual, but for the people of the United States," Garland told the Senate Judiciary Committee in his opening statement according to remarks released over the weekend. 

Garland's appearance comes nearly five years after Senate Republicans, including some currently sitting on the committee he'll be in front of today, refused to hold hearings on his nomination by former President Barack Obama to replace the late Justice Antonin Scalia on the Supreme Court. 

However, based on remarks from Sen. Chuck Grassley, R-Iowa, who is expected to address their previously stonewalling of Garland's nomination by shifting to attack Democrats for their treatment of Supreme Court Justice Brett Kavanaugh during his confirmation. 

"So yes, it’s true that I didn’t give him a hearing. I also didn’t mischaracterize his record. I didn’t attack his character. I didn’t go through his high-school yearbook. I didn’t make his wife leave the hearing in tears. I took a position on hearings, and I stuck to it," Grassley will say. 

Garland could also be forced to walk a fine line as he faces potential questions of whether his department should launch investigations into former President Donald Trump for his role in inciting the Jan. 6 riot at the Capitol, after Senate Minority Leader Mitch McConnell recently raised the prospect after his vote against convicting Trump that the ex-president still be held accountable by the criminal justice system. 

If confirmed, Garland will bring extensive background experience in the justice system to his role overseeing the department's more than 110,000 employees -- from serving more than two decades in the federal judiciary to his time as a top DOJ prosecutor during the Clinton administration, overseeing major investigations into the Oklahoma City bombing, Unabomber Ted Kaczynski and the Atlanta Olympics bombings.

-ABC News' Alexander Mallin

Merrick Garland, Biden's pick for attorney general, could face tricky political questions during his confirmation hearing before the Senate Judiciary Committee today. In the wake of the Jan. 6 attack on the Capitol, Garland and Democrats are expected to point to Garland's work prosecuting the Oklahoma City bombing as evidence of his ability to investigate and prosecute domestic terrorism.

"If confirmed, I will supervise the prosecution of white supremacists and others who stormed the Capitol on January 6 – a heinous attack that sought to disrupt a cornerstone of our democracy: the peaceful transfer of power to a newly elected government,” Garland will say.

Garland's opening statement also conveys a commitment to equity, saying that upholding the Civil Rights Act remains "urgent" for the Department of Justice. Garland has received ample bipartisan support, ahead of his confirmation hearings before Senate Judiciary Monday and Tuesday, 61 former federal judges and a bipartisan group of more than 150 former Justice Department officials have penned letters in support of Garland's confirmation.

-ABC News' Alexander Mallin and Benjamin Siegel