In pre-taped remarks, Biden's new Secretary of State Antony Blinken delivered his first address to the U.N. Human Rights Council since the U.S. moved to rejoin as an observer. Blinken said the U.S. will seek full-time membership for the 2022 term.

In his remarks, Blinken called for reform of the council, including members with anti-Israel bias and members that "undermine" human rights. He even called out a few countries by name, including Russia, Iran, Venezuela and China -- all members. Blinken also noted America’s imperfect human rights record, citing discrimination and violence toward Black, indigenous and Asian Americans.

"I recognize that any pledge to fight for human rights around the world must begin with a pledge to fight for human rights at home," Blinken said. "People of color in the United States deal every day with the consequences of systemic racism and economic injustice."

-ABC News' Conor Finnegan and Chad Murray

The president will hold a bipartisan meeting to discuss U.S. supply chains with House and Senate members in the Oval Office on Wednesday afternoon. Biden will later sign an executive order on the economy with Harris in attendance.

The order is expected to mandate a 100-day review of critical product supply chains in the U.S. focused on those for computer chips, large capacity batteries, active pharmaceutical ingredients and critical minerals and strategic materials, including rare earth minerals. The order is part of the administration's effort to secure domestic supply chains in the wake of the COVID-19 pandemic that highlighted vulnerabilities that currently exist.

-ABC News' Molly Nagle

The first of what will be many congressional hearings on the Capitol siege revealed how much is still not known about what happened Jan. 6 -- even after an impeachment trial, evidence unearthed in scores of prosecutions and countless hours of videos of the attack itself. Perhaps the most obvious blind spot is what former President Donald Trump knew and what he did about it in real-time.

Tuesday's hearing raised a series of questions that directly involve the previous administration. Current and former law-enforcement officials aren't sure why FBI intelligence didn't make its way to the Capitol Police or why National Guard and Pentagon resources weren't faster to arrive when it became clear how awful the situation was.

Judge Merrick Garland plans to make Jan. 6 investigations his first priority after he becomes attorney general. And even with additional hearings Wednesday, Thursday and beyond, the concept of a bipartisan commission to investigate the events leading up to and during the siege is gaining traction on Capitol Hill.
Many of the most consequential questions rest with Trump -- assuming he is put in a position of having to answer them.

-ABC News Political Director Rick Klein

Biden's pick for director of the Office of Management and Budget, Neera Tanden, was supposed to testify before the Senate Budget Committee Wednesday morning, however the committee postponed Tanden's confirmation hearing, according to two sources with knowledge of the matter.

In addition, a vote on the nomination in the Senate Homeland Security Committee has also been postponed, a spokesperson told ABC News that the delay was because, "members need more time to consider the nominee."

Moments after news broke that two Senate committees postponed their votes on Tanden's nomination, White House press secretary Jen Psaki defended Tanden in a Twitter thread, making clear the White House is standing by their nominee.

"Neera Tanden is a leading policy expert who brings critical qualifications to the table during this time of unprecedented crisis. She also has important perspective and values, understanding firsthand the powerful difference policy can make in the lives of those going through hard times," Psaki tweeted.

The nomination has been in trouble since lawmakers became critical of Tanden’s combative tweets aimed at Republicans and her effort to delete them before her nomination. Her nomination was in danger of being derailed when moderate Democratic Sen. Joe Manchin, D-W.Va., announced his opposition to her nomination, citing her temperament.

-ABC News' Trish Turner, Molly Nagle, Katherine Faulders and Sarah Kolinovsky

Three of Biden's picks for key administration positions have hearings before Senate committees Tuesday.

The Senate Energy and Natural Resources Committee will hold a hearing to consider Debra Haaland for secretary of the Interior. If the Senate confirms her as secretary of the interior, Haaland would be the first Native American to serve in a presidential Cabinet and would be the first Native person to oversee an agency that's played a major role historically in the forced relocation and oppression of Indigenous people.

The Senate Health, Education, Labor and Pension Committee will consider Xavier Becerra to serve as secretary of health and human services.

Republican opposition to Becerra has been mounting since Biden announced his nomination in December. On Monday, a group of Republican lawmakers penned a letter to Biden urging him to withdraw Becerra's nomination.

The group of lawmakers, including 11 senators and many more members of the House, argued that Becerra is inexperienced and ill-prepared to guide the agency. Democrats have argued that Becerra has extensive experience in health care policy, first as a congressman who oversaw components of Medicare and then as a defendant of Obamacare as attorney general, using that role to add new focus on the issue.

And the Senate Judiciary Committee will resume its hearing, which began Monday, to consider Merrick Garland for attorney general.

Garland received a fairly warm welcome from both sides of the aisle during Monday's hearing, and a few GOP senators expressed their support for Garland. In the first half of his confirmation hearing Monday, he told senators his first briefing once he takes office at the Justice Department will be on the Jan. 6 assault on the U.S. Capitol.

-ABC News' Cheyenne Haslett, Allison Pecorin, Luke Barr and Alexander Mallin