Secretary of Defense James Mattis stepped down on Thursday, notifying President Trump in a letter that he believes someone should be in the role whose "views are better aligned with yours" when it comes to international alliances and partnerships.

Mattis submitted the letter one day after Trump announced the Islamic State has been defeated and he wants to pull all U.S. troops from Syria, much to the delight of Russia. In his letter, Mattis said one "core belief" he's always held is "that our strength as a nation is inextricably linked to the strength of our unique and comprehensive system of alliances and partnerships. While the U.S. remains the indispensable nation in the free world, we cannot protect our interests or serve that role effectively without maintaining strong alliances and showing respect to those allies."

He also believes the United States "must be resolute and unambiguous in our approach to those countries whose strategic interests are increasingly in tension with ours. It is clear that China and Russia, for example, want to shape a world consistent with their authoritarian model — gaining veto authority over other nations' economic, diplomatic, and security decisions — to promote their own interests at the expense of their neighbors, America, and our allies."

Allies must be treated with respect and the U.S. "must do everything possible to advance an international order that is most conducive to our security, prosperity, and values," Mattis continued, and because he is of the opinion that Trump has "the right to have a Secretary of Defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position." His final day will be Feb. 28, 2019. Read the entire letter below. Catherine Garcia

The total number of U.S. coronavirus cases reached 3 million on Wednesday as officials confirmed a record 60,000-plus new cases over the previous 24 hours, and the national death toll rose above 132,000. States in the South and West continued to report spiking new infections. California and Texas both reported more than 10,000 new cases on Wednesday. U.S. deaths, which had been trending downward, rose by more than 900 for the second straight day, the highest level since early June, Reuters reports. Hospitalizations also have increased in the states where infections have jumped, including Florida, where 56 intensive care units this week reached capacity, and Arizona, where ICUs are rapidly filling up, too. Infections have risen in 42 of the 50 states over the past two weeks, according to Reuters. Harold Maass

A "massive search operation" is underway for the mayor of Seoul, who has been reported missing, The Associated Press reports.

South Korean police on Thursday said they're searching for Seoul Mayor Park Won-soon after he was reported missing by his daughter, according to Reuters. She says Park left "a will-like" message before he left their home, and she called police after not being able to reach him on his phone, which officials say is turned off, the AP reports. A signal from Park's phone was reportedly last detected in Sungbuk.

A government official confirmed to the AP that Park, who was elected mayor of South Korea's capital in 2011, didn't come to work on Thursday and canceled his schedules. Police say the search operation for Park consists of 150 officers, as well as a drone and a police dog. Brendan Morrow

The Supreme Court will reveal Thursday morning whether Congress, New York state prosecutors, and ultimately the American public will be able to see what's in the tax documents President Trump has worked so hard to keep secret. But on Wednesday night, the White House finally addressed another, lower-profile accounting of Trump's finances, his annual financial disclosure report, that was supposed to be handed in more than a week ago. The filing, required under federal ethics rules, is the only official document publicly detailing Trump's personal finances.

A White House official told The New York Times that Trump had requested an extension because the report was "complicated" and Trump has "been focused on addressing the coronavirus crisis and other matters." This is Trump's second coronavirus extension: The partial disclosure of his assets, debts, and family business performance was actually due in May, but all White House employees had been given a 45-day extension, until June 29, because of the COVID-19 pandemic. Vice President Mike Pence filed his disclosure report by that deadline.

Trump's delay follows conversations between ethics officials and his representatives over a draft of the disclosure report, people briefed on the matter tell the Times. The Office of Government Ethics and Trump Organization declined requests for comment on the filing. Peter Weber

It turns out "closing schools was a lot easier than reopening them" during the coronavirus pandemic, Myah Ward and Renuka Rayasam note at Politico. But Johns Hopkins University — which has made checking COVID-19 infection and death data easy with its coronavirus map — is trying to help, launching another site Thursday to help Americans track how different states plan to reopen schools this fall, plus guidelines from health and education agencies and organizations.

According to this new education tracker, run by the Johns Hopkins eSchool+ Initiative, 43 states and territories have released plans for reopening their schools. The site reviews each plan based on 12 criteria, including coronavirus protection measures, academics, and choices offered to students, teachers, and staff.

The goal of the tracker is to give parents, teachers, staff, school district leaders, and policymakers one place where they can access and compare reopening plans, Annette Anderson, deputy director of JHU's Center for Safe and Healthy Schools, tells Politico. "At the end of the day, it's about trying to make sure that when we reopen, that the reopening benefits all." Peter Weber

The Ventura County Sheriff's Department said late Wednesday that actress Naya Rivera is missing and the subject of a search at Lake Piru, northwest of Los Angeles. Rivera, 33, rented a pontoon boat at the reservoir Wednesday afternoon and her 4-year-old son was found alone in the boat, asleep and wearing his life jacket. Rivera's wallet and ID were also in the boat. The son, who got back in the boat after a swim with his mother, "is in good health," said Capt. Eric Buschow of the sheriff's department. The search, suspended Wednesday night, will continue Thursday with divers and air units.

Rivera played Santana, a cheerleader, on 113 episodes of the TV musical comedy Glee, and dated Glee co-star Mark Salling, who killed himself in 2018 after pleading guilty to possession of child pornography. The son is from her marriage to actor Ryan Dorsey. Peter Weber

Lisa Kudrow was Conan O'Brien's socially distant guest on Wednesday's Conan, and he asked her whether the eagerly anticipated Friends reunion was still going to happen after a coronavirus delay. "We have something on the books for us to do it, you know, at some point in August," Kudrow said. "And we'll see. I mean, we're all still waiting for guidelines for shooting things." O'Brien immediately came up with a plan to spoil the reunion, and Kudrow added some suggestions to make it an absolute abomination for fans.

"I'm good at thinking of ideas that ruin things," O'Brien said. "That would be a great prank, a great prank on America." Because that's what America needs right now: a great prank. Watch below. Peter Weber