Emotional stories, graphic videos and animated arguments echoed in the Senate chamber on Tuesday as the constitutionality of former President Trump's impeachment trial was debated.

The transition process is routine for an incoming administration, although there were questions about what the Biden team would do about both the Hunter Biden and the Durham probes.

The Senate impeachment trial starts Tuesday. Former President Donald Trump's lawyers argue it is "political theater," while the impeachment managers work to prove he incited an insurrection.

House managers say the former president is responsible for the Jan. 6 riot. But Trump's attorneys argue that his "speech was never directed to inciting or producing any imminent lawless action."

The insurrection at the U.S. Capitol has put a focus on the need to combat domestic terrorism. What is the FBI doing already, and what more could it do to counter violent extremists?

Former President Donald Trump's lawyers say he cannot be tried by the Senate for incitement of insurrection because he is no longer in office.

In a separate filing due ahead of next week's trial, former President Donald Trump's defense team calls the impeachment effort unconstitutional and denies he incited the crowd on Jan. 6.

NPR looks into former President Donald Trump's two impeachment defense lawyers who are heading his upcoming Senate trial: David Schoen and Bruce Castor Jr.

The former FBI attorney, Kevin Clinesmith, had pleaded guilty to altering an email used to get surveillance on former Trump campaign adviser Carter Page.

The Department of Justice said it would spare no resource to bring to justice those responsible for the deadly insurrection at the U.S. Capitol.

Nearly three weeks after the insurrection at the Capitol, prosecutors have charged more than 120 people. NPR offers an update on the investigation and looks at the role played by extremist groups.

White House press secretary Jen Psaki announced a series of steps the Biden administration is taking to try to tackle the threat of domestic extremism.

FBI Director Christopher Wray is less than four years into his 10-year term. He was confirmed to lead the FBI in August 2017 after former President Donald Trump fired James Comey.

Bannon and Lil Wayne were two of dozens of people granted clemency by Trump just hours before his terms comes to a close.

The Justice Department has opened more than 170 cases into the insurrection at the U.S. Capitol, said the acting U.S. attorney on Tuesday — adding that it expects to investigate hundreds more.

As the probe into the breach of the Capitol building by pro-Trump extremists continues, a big question remains unanswered: What role, if any, did organized groups have in spearheading the violence?

Authorities have brought federal charges against more than a dozen individuals for their alleged role in storming the Capitol.

On Thursday, President-elect Joe Biden announced the team he wants to lead the Justice Department. It has its work cut out, including with the aftermath of Wednesday's violence on Capitol Hill.

FBI, ATF, regional law enforcement and National Guard personnel responded to the Capitol on Wednesday after it was breached by pro-Trump extremists.

John Demers looks back on his latest stretch in the Justice Department in an exclusive interview with NPR. Cyber threats from Russia and China will remain a big problem, he warns.