KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

Good morning. Here are some of the headlines we're following today:

For Subscribers

FOR SUBSCRIBERSAbdul El-Sayed tries to woo MAHA voters as Democrats seek inroads with RFK’s supporters

FOR SUBSCRIBERSKratom-like substances are popping up in a typically benign supplement

FOR SUBSCRIBERSGOP super PAC increases its spending for Sen. Jon Husted in tough Ohio race

FOR SUBSCRIBERSRecords reveal tumultuous marriage between slain New York Times executive and wife

FOR SUBSCRIBERSFrom clean energy warrior to ‘wall of shame,’ James Talarico reverses on a fossil fuel money pledge

FOR SUBSCRIBERSCongressional staff planned official trip with luxury stops in Italy and France weeks before election

FOR SUBSCRIBERSA harrowing ordeal aboard an Israel-bound plane

FOR SUBSCRIBERSOpenAI CEO Sam Altman to skip congressional hearing on rogue AI agents

FOR SUBSCRIBERSKey DOJ lawyers departed Trump ‘grand conspiracy’ probe amid pressure to produce, source says

FOR SUBSCRIBERSTrump’s new AI chatbot often links to a site launched under Clinton 26 years ago

FOR SUBSCRIBERSAt MAHA summit, industry CEOs the movement once vilified take the stage

FOR SUBSCRIBERSThis Paralympian has two goals: Win medals and give away $500,000 to her teammates

FOR SUBSCRIBERSCornell rape allegation spotlights stringent New York state laws that have long drawn criticism

FOR SUBSCRIBERSThe debate over AI’s future rages on both coasts

FOR SUBSCRIBERSDecades-old march dispute reignites in Northern Ireland, threatening political crisis

For Subscribers

FOR SUBSCRIBERSAbdul El-Sayed tries to woo MAHA voters as Democrats seek inroads with RFK’s supporters

FOR SUBSCRIBERSKratom-like substances are popping up in a typically benign supplement

FOR SUBSCRIBERSGOP super PAC increases its spending for Sen. Jon Husted in tough Ohio race

FOR SUBSCRIBERSRecords reveal tumultuous marriage between slain New York Times executive and wife

FOR SUBSCRIBERSFrom clean energy warrior to ‘wall of shame,’ James Talarico reverses on a fossil fuel money pledge

FOR SUBSCRIBERSCongressional staff planned official trip with luxury stops in Italy and France weeks before election

FOR SUBSCRIBERSA harrowing ordeal aboard an Israel-bound plane

FOR SUBSCRIBERSOpenAI CEO Sam Altman to skip congressional hearing on rogue AI agents

FOR SUBSCRIBERSKey DOJ lawyers departed Trump ‘grand conspiracy’ probe amid pressure to produce, source says

FOR SUBSCRIBERSTrump’s new AI chatbot often links to a site launched under Clinton 26 years ago

FOR SUBSCRIBERSAt MAHA summit, industry CEOs the movement once vilified take the stage

FOR SUBSCRIBERSThis Paralympian has two goals: Win medals and give away $500,000 to her teammates

FOR SUBSCRIBERSCornell rape allegation spotlights stringent New York state laws that have long drawn criticism

FOR SUBSCRIBERSThe debate over AI’s future rages on both coasts

FOR SUBSCRIBERSDecades-old march dispute reignites in Northern Ireland, threatening political crisis

1. Trump Hits New High, Clinton Maintains Big Lead

As we head into the biggest day of the presidential primaries — Super Tuesday — Donald Trump and Hillary Clinton continue to hold commanding leads in their respective primaries, according to our NBC News|SurveyMonkey Weekly Election Tracking Poll for the week of Feb. 22 through Feb. 28. Read more in POLITICS.

2. Final Batch of Hillary Clinton's Emails Released

The State Department on Monday released the 14th and final batch of emails from former Secretary of State Hillary Clinton's private server, bringing the total to more than 52,000 — including 2,100 that were censored or withheld completely for containing information now deemed classified. Read more in NEWS.

3. SCOTUS Justice Breaks 10-Year Courtroom Silence

Justice Clarence Thomas broke his decade-long run of asking no questions during Supreme Court oral arguments on Monday in a case about gun rights. And he didn't just ask one but ten questions of a Justice Department lawyer who was defending a federal law that bans anyone who has a misdemeanor domestic violence conviction from owning a gun. Read more in NEWS.

4. Erin Andrews: Stalker's Nude Videos 'Ripped Me Apart'

Occasionally sobbing, sportscaster Erin Andrews testified Monday about her frustration as nude videos of her propagated across the Internet despite her willingness to pay "whatever it took" to remove them. Andrews began testifying late in the day in Nashville, Tennessee, in her lawsuit against the man who stalked her and posted the videos and the management and owner of one of the hotels where he shot the video. Read more in NEWS.

5. Vatican Cardinal: Pedophile Priest 'Wasn't of Much Interest'

There were audible gasps Tuesday when Vatican treasurer George Pell said a notorious Roman Catholic Church sex-abuse case "wasn't of much interest" to him. He insisted during testimony there was no reason for him to know the extent of the abuse carried out by his one-time roommate — pedophile priest Father Gerald Ridsdale — who was later convicted of 138 offences against more than 50 children. Read more in NEWS.

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Cardinal Pell: Sex Abuse Case Wasn't Of Much Interest To Me

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6. TIME Contacts Secret Service Over Tussle at Trump Rally

TIME said it has expressed concern to the Secret Service following a violent confrontation between an agent and a photographer working for the publication at a Donald Trump rally. Videos circulated on social media show the photographer swearing at a Secret Service agent who apparently tried to prevent him from leaving the press pen. Read more in NEWS.

7. Texas Candidate's Office Shot in Apparent Racial Attack

Five people were taken into custody and questioned late Monday in connection with the apparent racially motivated shooting at the Texas campaign office of Zena Stephens, who is African American and seeking the Democratic nomination to run for the role of sheriff in Jefferson County. No one was hit or injured. Read more in NEWS.

Nightly Spotlight: Lack of Sleep Increases Junk Food Cravings: Study

If you're one of the millions of Americans who would like to lose a few pounds, new research suggests part of the problem may be how much sleep you're getting.