Jen Psaki, who previously served as Obama's communications director, will serve as President-elect Joe Biden's press secretary, the transition team announced Sunday.

The big picture: All of the top aides in Biden's communication staff will be women, per the Washington Post, which first reported Psaki's appointment.

President-elect Biden has an aggressive Day 1 immigration agenda that relies heavily on executive actions to undo President Trump's crackdown.

Why it matters: It's not that easy. Trump issued more than 400 executive actions on immigration. Advocates are fired up. The Supreme Court could threaten the Deferred Action for Childhood Arrivals (DACA) program, and experts warn there could be another surge at the border.

Joe Biden is considering retired four-star General Lloyd Austin as his nominee for defense secretary, adding him to a shortlist that includes Jeh Johnson, Tammy Duckworth and Michele Flournoy, two sources with direct knowledge of the decision-making tell Axios.

Why it matters: A nominee for Pentagon chief was noticeably absent when the president-elect rolled out his national security team Tuesday. Flournoy had been widely seen as the likely pick, but Axios is told other factors — race, experience, Biden's comfort level — have come into play.

Rep. James Clyburn (D-S.C.) told The Hill on Wednesday that Joe Biden has so far fallen short when it comes to appointing Black people to his Cabinet.

Why it matters: Clyburn, a Biden ally, played a crucial role in helping secure the president-elect's path to the White House during the Democratic primary. His endorsement was pivotal in reviving the former VP's campaign when it appeared to be flailing.

The Trump White House on Tuesday gave President-elect Biden access to daily presidential intelligence briefings, a source familiar with the matter tells Axios.

Why it matters: Trump has refused to share the briefs until now, as he continues to challenge the result of the election and declines to concede. The president's acquiescence comes as another sign that the transition to a Biden administration is taking place.

The incoming administration will face a slew of cybersecurity-related challenges, as Joe Biden takes office under a very different environment than existed when he was last in the White House as vice president.

The big picture: President-elect Biden's top cybersecurity and national security advisers will have to wrestle with the ascendancy of new adversaries and cyberpowers, as well as figure out whether to continue the more aggressive stance the Trump administration has taken in cyberspace.

Avril Haines, Biden’s pick for director of national intelligence, has a long history of working on critical cybersecurity and digital challenges facing the intelligence community.

Why it matters: A deep understanding of cyber issues is of great value in the position, including as the Biden administration seeks to restore faith in a role that has faced accusations of politicization in the Trump era.

Palestinian leaders are considering several initiatives that they hope will encourage strong relations with the incoming administration and make it easier for Biden to roll back Trump's policies.

Why it matters: After four years of deep crisis in U.S.-Palestinian relations, President Mahmoud Abbas desperately needs to rebuild his standing in Washington.

Advocates are pushing President-elect Biden to tackle systemic racism with a Day 1 agenda that includes ending the detention of migrant children and expanding DACA, announcing a Justice Department investigation of rogue police departments and returning some public lands to Indigenous tribes.

Why it matters: Biden has said the fight against systemic racism will be one of the top goals of his presidency — but the expectations may be so high that he won't be able to meet them.

Reps. Alexandria Ocasio-Cortez and Ilhan Omar are boosting a petition against Joe Biden nominating his former chief of staff to a new role in his administration, calling Bruce Reed a "deficit hawk” and criticizing his past support for Social Security and Medicare cuts.

Why it matters: Progressives are mounting their pressure campaign after the president-elect did not include any of their favored candidates in his first slate of Cabinet nominees, and they are serious about installing some of their allies, blocking anyone who doesn't pass their smell test — and making noise if they are not heard.