In a late-Friday ruling on Dec. 14, U.S. District Judge Reed O'Connor in Fort Worth ruled that the Affordable Care Act is unconstitutional, siding with a group of Republican state attorneys general. On Sunday, O'Connor wrote that he stands by his decision that ObamaCare must be ended nationwide because of the zeroed-out individual mandate, but he is staying his ruling because "many everyday Americans would ... face great uncertainty" if it went into effect before appellate courts and possibly the Supreme Court weighed in. Most legal scholars expect O'Connor's ruling to be overturned, though he does have his boosters, too. Peter Weber

Tesla says it's investigating after a video emerged seeming to show one of its Model S cars exploding.

Footage began to spread in China on April 21 showing smoke emerging from a Tesla vehicle, which subsequently bursts into flames in a Shanghai parking lot, CNN reports.

Since 2013, at least 14 incidents have occurred involving Tesla vehicles catching fire, although typically after a crash, Reuters reports. In January 2019, the company was sued by the parents of a teenager who was killed in a Tesla crash, alleging the Model S has "inadequate measures to prevent a post-collision fire" and its battery pack is defective, per MarketWatch.

Tesla confirmed that it's looking into the Shanghai incident, saying that "we immediately sent a team on-site and we're supporting local authorities to establish the facts." Other details about the apparent explosion aren't yet available, but Tesla said that "from what we know now, no one was harmed." Brendan Morrow

Like millions of people not running for president — and there are still a few Americans not in the race yet — Sen. Elizabeth Warren (D-Mass.) wants "to find out who lives, who dies, and who ends up on the spiky iron chair" in Game of Thrones, she writes at New York's The Cut. "But for me, the hit HBO show is about more than a death count (I'll leave that to Arya). It's about the women."

Warren goes on to give a brief recap of Game of Thrones, focusing on two female protagonists, Daenerys (Dany) Targaryen — "my favorite from the first moment she walked through fire" — and "the villain we love to hate, Queen Cersei of Casterly Rock." Her recap unsurprisingly touches on some themes that fit both Westeros and 2020 U.S. presidential politics:

As much as Dany wants to take on her family's enemies and take back the Iron Throne, she knows that she must first fight the army of the dead that threatens all mankind. This is a revolutionary idea, in Westeros or anywhere else. A queen who declares that she doesn't serve the interests of the rich and powerful? A ruler who doesn't want to control the political system but to break the system as it is known? It's no wonder that the people she meets in Westeros are skeptical. [Elizabeth Warren, New York]

Mostly, however, Warren gives a brief, straightforward recap of how the cultish HBO show has progressed from Season 1 to Season 8, with a little extra focus on the pernicious role of the Iron Bank in crushing popular will and governance and the evils of slavery. "We've got five episodes to find out if the people can truly break their chains, destroy the wheel, and rise up together to win," Warren writes. Presumably, the battle for the U.S. presidency will involve much less bloodshed and incest. Read Warren's entire recap at The Cut. Peter Weber

Rep. Seth Moulton (D-Mass.) became the 19th Democrat to join the 2020 Democratic race on Monday, declaring the field "wide open" and saying he planned to focus on national security and defense issues. Moulton is also the third presidential candidate from Massachusetts — following Sen. Elizabeth Warren (D) and former Gov. William Weld (R) — and like South Bend Mayor Pete Buttigieg, he's an Iraq War veteran. He last made national news leading an unsuccessful leadership challenge against House Speaker Nancy Pelosi (D-Calif.).

"I'm running because we have to beat Donald Trump, and I want us to beat Donald Trump because I love this country," Moulton said in his campaign launch video. "We've never been a country that gets everything right. But we're a country that, at our best, thinks that we might." He will be on Rachel Maddow's MSNBC show Monday night and plans to hit all four early voting states this week, starting with New Hampshire on Tuesday. Peter Weber

Sri Lanka's government said Monday that a coordinated series of bombings that killed at least 290 people and wounded 500 on Sunday had been carried out by seven suicide bombers from National Thowfeek Jamaath, a little-known Islamist militant group. All the bombers and most of the victims were Sri Lankan, the government said, though authorities are investigating possible foreign links to the attack. At least 24 people were arrested.

The first six bombings hit three Christian churches holding Easter services and three luxury hotels. Among the dead were 32 foreigners from the U.S., Britain, Turkey, India, China, Portugal, and the Netherlands; Danish billionaire Anders Hoch Povlsen said three of his four children died in the attacks.

Sri Lankan Prime Minister Ranil Wickremesinghe confirmed Sunday night that security services had been "aware of information" about a possible attack on churches and had not acted on it. An April 11 domestic intelligence report seen by Reuters said a foreign intelligence service had warned Sri Lanka about possible attacks. Two government ministers also said publicly that there had been warnings, some specific to popular churches.

The Easter bombings were the deadliest incident in Sri Lanka since a 26-year-long civil war ended in 2009 between the country's mostly Buddhist Sinhalese majority and its Tamil minority, made up of Hindus, Christians, and Muslims. "While anti-Muslim bigotry has swept the island in recent years, fed by Buddhist nationalists, the island also has no history of violent Muslim militants," The Associated Press reports. "The country’s small Christian community has seen only scattered incidents of harassment in recent years." Peter Weber

Special Counsel Robert Mueller's investigators followed "several meandering paths" in their two-year investigation, "propelled by discoveries of unusual interactions between Trump associates and Russians," The Washington Post reported Sunday night. Mueller uncovered a lot in his 448-page final report, but his team was left with "some unanswered mysteries, a lot of dead ends and, ultimately, a conclusion that the contacts they found did not establish a criminal conspiracy," the Post says.

Mueller's team had to grapple with a legal dispute with Attorney General William Barr over whether a president can even be accused of crimes, plus President Trump and his son Donald Trump Jr. refused to be interviewed, and the witnesses they did have "were not ideal," the Post reports:

A few key players, prosecutors would contend, lied in interviews. Many were loyal to the president and echoed his rhetoric that Mueller's team was acting in bad faith. Some used encrypted applications with disappearing messages that could not be reviewed. Others were overseas, unreachable to American investigators. In some cases, their statements were only loosely tethered to the facts. [The Washington Post]

Ex-Trump campaign chairman Paul Manafort fits in the first three categories, and the "loosely tethered" description matches conspiracy theorist Jerome Corsi, the Post reports, citing an interview with Corsi's lawyer, David Gray. Corsi had offered "tantalizing leads" about Roger Stone and WikiLeaks, but his story was never quite straight and his leads always led to dead ends, the Post reports.

Trying to get actionable material out of Corsi, "it's their biggest nightmare," Gray told the Post. "The supposed best of the best were just frankly dumbfounded by the whole situation." Corsi was not charged, he added, because after six marathon interviews, "at the end of the day, they threw up their hands and said, 'We can't use any of this.'" Read more about the obstacles Mueller could'nt get over at The Washington Post. Peter Weber

John Oliver's main story on Sunday's Last Week Tonight focused on — what else? — Special Counsel Robert Mueller's report, which he framed as the latest and maybe last chapter of his "Stupid Watergate" series — "basically Watergate, but if Nixon had been kicked in the head by a billy goat, and also if that billy goat had been the White House chief of staff."

Once people actually read the 448-page redacted report released Thursday, "it became clear that there was a lot in it," Oliver said. "And some of the details in this report were incredible." The one he lingered on, with artistic license, was Trump reportedly saying Mueller's appointment marked "the end of my presidency, I'm f---ed" — except Oliver, of course, did not censor the F-word. Since "we clearly can't cover everything in the report tonight," he said, "I'd like to concentrate on two key factors that may have saved the president here": Incompetence and disobedience.

"When it comes to conspiracy, Trump's saving grace may have been that despite Russians wanting to help," his campaign and family displayed "often cartoonish levels of disorganization and incompetence," plus "ignorance of basic legal concepts," Oliver said. He said the report's findings that so many of the people in Trump's orbit just ignored his orders to potentially obstruct justice is "both reassuring and also terrifying," though worryingly, "lots of those people are gone now, and the newer figures seem very much on the same page as the president," notably Attorney General William Barr.

Barr's preemptive spin now "seems laughably and willfully misleading," Oliver said. "It's like Barr summarized the Twilight novels as: 'A girl in Florida goes to third base with a wookie.'" The parts of Mueller's report we can read may feel like a letdown, he said, but its imparted knowledge "can inform Congress going forward and, crucially, voters a year and a half from now." The clip is full of NSFW language. Watch below. Peter Weber