The fourth and potentially most significant day of public impeachment hearings is about to begin.

Gordon Sondland, U.S. ambassador to the European Union, will testify before Congress on Wednesday as part of the ongoing impeachment inquiry into President Trump, which focuses on whether Trump improperly pressured Ukraine to open investigations that might benefit him politically, including by withholding military aid.

Earlier this month, Sondland revised his earlier closed-door testimony to admit he told Ukraine aid to the country that was being held up would likely not be released "until Ukraine provided the public anticorruption statement that we had been discussing for many weeks," The New York Times reports. As to why Sondland didn't mention this when he originally testified and said that he didn't "recall taking part in any effort to encourage an investigation into the Bidens," he said he had since had his recollection "refreshed."

Of all the witnesses who have testified in the public impeachment hearings so far, The New York Times reports Sondland is the one who people close to Trump are most concerned about, as they have expressed "worry that he interacted directly with the president about Ukraine and that they do not know what he will say." The Times notes Sondland is also likely to face questions about why he didn't disclose a phone call he had with Trump about "the investigations" on July 26, which was first revealed during the public testimony of William Taylor, acting ambassador to Ukraine.

The Sondland hearing is scheduled to get underway at 9:00 a.m. Eastern. Also set to testify on Wednesday are Pentagon official Laura Cooper and State Department official David Hale. The impeachment hearing can be streamed below via PBS. Brendan Morrow

One of former President Donald Trump's last acts in office was issuing a directive extending free Secret Service protection to his four adult children and two of their spouses for the next six months, three people with knowledge of the matter told The Washington Post.

It's not just his adult children benefiting — Trump also directed that former Treasury Secretary Steven Mnuchin, former White House Chief of Staff Mark Meadows, and former National Security Adviser Robert O'Brien also continue to receive Secret Service protection for six months, two people familiar with the matter told the Post. This 24-hour security will be funded by taxpayer money, and is expected to cost millions.

Per federal law, only Trump, former first lady Melania Trump, and their 14-year-old son, Barron, are entitled to Secret Service protection now that they have left the White House; while Donald and Melania can receive protection for the rest of their lives, Barron is only entitled to it up until his 16th birthday.

The Post notes that presidents have the ability to order Secret Service protection for anyone they want, but it is extremely unusual for an outgoing president to order this type of security for their children that are well into adulthood. It is also unclear if there is precedent for ordering security for former aides. Former Presidents Bill Clinton and George W. Bush requested security extensions for their daughters, who were in college when their presidencies ended. Once former President Barack Obama was out of office, his daughters — one in high school, the other on a gap year from college — received a short extension of security.

During Trump's presidency, his adult children took more than 4,500 trips, including vacations and business travel for the Trump Organization, the Post reports. Taxpayers paid millions of dollars for Secret Service agents to accompany them on those jaunts. Catherine Garcia

President Biden and Vice President Kamala Harris' inauguration celebrations ended with a bang.

To cap off the 90-minute Celebrating America inaugural special on Wednesday night, Katy Perry sang her hit "Firework," as pyrotechnics exploded behind her, lighting up Washington, D.C. Biden, first lady Dr. Jill Biden, and their family watched the show from the White House, while Harris and her husband, Doug Emhoff, took it all in from the Lincoln Memorial. Catherine Garcia

President Biden addressed the nation during the Celebrating America inaugural special Wednesday night, saying that to "overcome the challenges in front of us," the country must find "the most elusive of all things in a democracy: Unity."

Speaking from the Lincoln Memorial, Biden said the United States has learned "democracy is precious, and because of you, democracy has prevailed." Americans are "good people," Biden said, and he called on the country to unite in favor of "opportunity, liberty, dignity, and respect" and against "common foes" like "hate, violence, disease, and hopelessness."

The only way the U.S can "get through the darkness around us" is by coming together, Biden said. There are moments, like the Civil War, when "more is asked of us Americans," he declared. "We are in one of those moments now. The pandemic, economic crisis, racial injustice, the climate crisis, and threats to our very democracy. The question is: Are we up for it?"

Biden has no doubt that people will unite, adding, "You the American people are the reason why I've never been more optimistic about America than I am this very day. There isn't anything we can't do if we do it together." Catherine Garcia

The Senate on Wednesday evening voted 84-10 to confirm Avril Haines as director of national intelligence.

Haines is the first woman to serve as head of the intelligence community, and is also the first member of President Biden's Cabinet to receive Senate confirmation. She served as deputy national security adviser and deputy CIA director in the Obama administration.

During her confirmation hearing on Tuesday, Haines said "when it comes to intelligence, there is simply no place for politics, ever." After Biden announced in November that he wanted Haines to serve as director of national intelligence, Haines declared she would "speak truth to power" and knew Biden valued "the perspective of the intelligence community." Catherine Garcia

The Biden administration held its first press briefing on Wednesday evening, with White House Press Secretary Jen Psaki promising that every weekday, there will be a news conference.

"There are a number of ways to combat misinformation," Psaki said. "One of them is accurate information and truth and data and sharing information, even when it is hard to hear." She added that her daily briefings will include COVID-19 updates from health officials.

Psaki said President Biden's first call with a foreign leader will be on Friday with Canadian Prime Minister Justin Trudeau, and she expects "they will certainly discuss the important relationship with Canada as well as the decision on the Keystone pipeline that was announced today." Shortly after taking office on Wednesday, Biden signed an executive order halting construction on the pipeline, meant to transport crude oil from Canada to the Midwest.

Biden is expected to spend the next several days calling "partners and allies" of the United States, Psaki said, because "he feels that's important to rebuild those relationships and address the challenges and threats we're facing in the world."

Psaki was also asked about the letter former President Donald Trump left for Biden, which he earlier described as being "very generous." Biden said because it was "private," he will "not talk about it until I talk to him." Psaki reiterated that the letter was "generous and gracious," but she does not believe a call from Biden to Trump is imminent. Catherine Garcia

Several world leaders on Wednesday sent their congratulations to President Joe Biden and Vice President Kamala Harris, with some also getting in a final jab at former President Donald Trump.

Spanish Prime Minister Pedro Sanchez said Biden represented "victory of democracy over the ultra-right. Five years ago, we thought Trump was a bad joke, but five years later we realized he jeopardized nothing less than the world's most powerful democracy."

His comments were echoed by German President Frank-Walter Steinmeier, who said he was "greatly relieved" by Biden's win. Referring to the pro-Trump mob that stormed the U.S. Capitol on Jan. 6, Steinmeier added, "Despite all the joy we feel today, we must not forget that even the most powerful democracy in the world has been seduced by populism. We must work resolutely to counter polarization, protect and strengthen the public square in our democracies, and shape our policies on the basis of reason and facts."

French President Emmanuel Macron tweeted that he was thrilled Biden brought the United States back into the Paris Agreement on climate change, stating that by working together, "We will be stronger to face the challenges of our time. Stronger to build our future. Stronger to protect our planet." Catherine Garcia