Democrats have called for Barr and his predecessor as attorney general, Jeff Sessions, to testify under oath.
Manchin is reportedly undecided on whether or not to confirm Biden's interior secretary nominee.
Former Senator and Attorney General Jeff Sessions was defeated by Tommy Tuberville, who President Donald Trump staunchly supported, in the Alabama GOP primary.
"Some of you have reported that I slapped or hit him," Tommy Tuberville said in 2012. "You're dead wrong."
President Trump endorsed former football coach Tommy Tuberville ahead of Tuesday's runoff.
Ghislaine Maxwell pleaded not guilty at her bail hearing Tuesday, as her lawyers maintain that she "vigorously denies the charges, intends to fight them and is entitled to the presumption of innocence."
"And he's great, Lou Saban, what a great job he's done," President Donald Trump said Monday, apparently referencing current Alabama football coach Nick Saban.
The president has thrown his weight behind Jeff Sessions' rival for the nomination, Tommy Tuberville, ahead of the primary vote.
Sessions called his opponent Tommy Tuberville "cowardly to debate," in response to Trump's tweet.
"Unless there is some dramatic change, a week from today Tommy Tuberville is soon to be the junior senator from Alabama," a political consultant told Newsweek.
"Jeff, you had your chance & you blew it," the president tweeted Saturday.
Trump has felt ire for Sessions ever since March 2, 2017 when Sessions recused himself from the Department of Justice's investigation into Russia's involvement in the 2016 presidential election.
"Who do we owe our responsibility to as government and public officials? It's to the American people first," Jeff Sessions had said.
President Donald Trump endorsed former Auburn University football coach Tommy Tuberville's bid for the old U.S. Senate seat of former Attorney General Jeff Sessions Tuesday, sending a clear message of disapproval to his former AG.
The former U.S. attorney is down by about 12 percentage points to the retired Auburn football coach Tommy Tuberville leading up to the March 31 Senate runoff in Alabama.
Sessions is pitching himself to Alabama voters as an ardent Trump loyalist despite being "forced...out" of the office by the president in November 2018, as The New York Times described the tense White House split.
"Staying silent will only lead observers to infer that you care more about book royalties than, you know, who should be the president of the United States," Daniel W. Drezner wrote.
"President Trump called him weak, confused, ineffective," S.E. Cupp said.
"I don't get it. Do voters really want somebody that weak representing them in Washington?" Joe Scarborough said.
Former Attorney General Jeff Sessions announced that he is running for his old senate seat Thursday, praising President Donald Trump despite a contentious former relationship. Negative ads had already arrived before the announcement, including one branding Sessions a "traitor."
President Donald Trump reportedly sent a warning to his former attorney general, who is considering standing in Alabama's Republican primary for the U.S. Senate.
Donald Trump has previously denied reporting that he mocked Jeff Sessions as a "dumb Southerner."
Sessions reportedly voiced his mistrust of "those new people with nose rings and tattoos—who knows what they're doing?"
Exports from medicinal cannabis are expected to bring in about $1 billion in tax revenue for the Israeli government.
Although former Attorney General Jeff Sessions no longer works with the administration, he praised Trump's work ethic.
"If Sessions wants to run I expect them [the White House] to pick them a candidate and bash Sessions for a year-and-a-half."