Today's Headlines Friday, May 6, 2016:

Top News Paul Ryan Says He Is 'Not Ready' to Endorse Donald Trump By JENNIFER STEINHAUER and ALEXANDER BURNS After the House speaker said he couldn't endorse Mr. Trump, the presumptive Republican nominee fired back that he was "not ready to support Speaker Ryan's agenda." F.D.A. Imposes Rules for E-Cigarettes in a Landmark Move By SABRINA TAVERNISE New federal regulations, to take effect in 90 days, ban the sale of e-cigarettes to minors and require producers to disclose ingredients to regulators. One Week in April, Four Toddlers Shot and Killed Themselves By JACK HEALY, JULIE BOSMAN, ALAN BLINDER and JULIE TURKEWITZ Shootings by preschoolers are happening at an average pace of about two per week. A child who accidentally pulls the trigger is most likely to be 3 years old. Editors' Picks TRAVEL Starry Nights in the Canary Islands By NINA BURLEIGH Astrotourism is taking hold in the Spanish territory, long a favorite of astronomers who have perched powerful telescopes on volcanic peaks. OPINION | OP-ED | MUSTAFA AKYOL Whatever Happened to the 'Turkish Model'? By MUSTAFA AKYOL Recep Tayyip Erdogan's Justice and Development Party claimed to be liberal as long as it was convenient. Today's Videos  VIDEO: Caitlyn Jenner Meets Her Critics The reality star and transgender activist Caitlyn Jenner, who has been denounced for her politics by the gay, lesbian, bisexual and transgender community, visited a high school in Brooklyn with Nicholas Kristof to meet some of her critics.  VIDEO: Illustrated Interview | Buzz Aldrin The octogenarian astronaut, who recently co-wrote the book ''No Dream Is Too High,'' sketched his answers with pencil over a period of two weeks. World In Syria, Russia Plays Bach Where ISIS Executed 25 By ANDREW E. KRAMER and ANDREW HIGGINS Russia sent an orchestra to play in Palmyra, retaken in March from the Islamic State.  Airstrikes Kill More Than 30 in Syrian Refugee Camp How Erdogan Moved to Solidify Power by Ousting a Pivotal Ally By TIM ARANGO and CEYLAN YEGINSU President Recep Tayyip Erdogan of Turkey has purged the judiciary of enemies, jailed journalists and crushed protests. Now, he has ousted his closest political ally, Prime Minister Ahmet Davutoglu. Brazilian Lawmaker Behind Rousseff Impeachment Is Told to Step Down By SIMON ROMERO The ruling against Eduardo Cunha sidelines an opponent of President Dilma Rousseff, but is not expected to prevent her ouster. U.S. North Carolina Officials Say They'll Defy Federal Deadline on Bathroom Law By ALAN BLINDER and RICHARD FAUSSET The speaker of the State House called the Monday deadline "unreasonable" but also seemed to signal that Republicans might eventually agree to alter the law. Debate Erupts in California Over Curriculum on India's History By JENNIFER MEDINA The dispute centers on what to call the region of South Asia and how to portray its culture in the state's textbooks. Alligator Wrestling in Colorado? A Draw for Thrill Seekers, and Critics By JULIE TURKEWITZ A valley in the southern part of the state finds that wrestling beasts with names like Darth Gator attracts thrill seekers, tourist dollars - and critics. Politics In Donald Trump's Rise, Allies See New American Approach By DAVID E. SANGER and JIM YARDLEY Confidence that Mr. Trump would fade has given way to a shocked recognition that he could upend decades of assumptions about American foreign policy. Once Donald Trump Is Nominee, He Is Likely to Get Intelligence Briefing By CHARLIE SAVAGE The White House press secretary said the president would leave it to intelligence professionals to decide what to share with Mr. Trump. Bernie Sanders's Online Foot Soldiers Weigh Their Next Campaign By JONATHAN MAHLER and NICK CORASANITI If Mr. Sanders ends his presidential bid, he will leave behind an army unmatched in size, influence and capabilities. The question is whether, and how hard, they would work for Hillary Clinton. Business Sumner Redstone Trial Captivates Hollywood and Wall Street By EMILY STEEL A suit challenging Mr. Redstone's mental competence, filed by a former companion who was removed from his house and his will, goes to trial on Friday.  Sumner Redstone Video Testimony Will Open His Competency Trial  How Sumner Redstone Went From Army Cryptographer to Media Mogul 2 Big Labor Unions Share Efforts to Gain Power and Scale By STEVEN GREENHOUSE and NOAM SCHEIBER The Service Employees International Union and the American Federation of State, County and Municipal Employees are collaborating in ways some see as a path to a merger. Energy Transfer Sees a Way Out of Its Williams Pipeline Deal By LESLIE PICKER Energy Transfer's outside legal adviser was unable to provide a certain tax opinion, a condition required to close the deal. Technology COMMON SENSE Facebook Has 50 Minutes of Your Time Each Day. It Wants More. By JAMES B. STEWART The average person spends more time on Facebook than any other leisure activity surveyed by the government except watching TV and movies. Via Attracts Financing, Despite Silicon Valley's Nervousness About Ride Sharing By MICHAEL J. de la MERCED The car-pooling company - a rival to Uber and Lyft - was to announce Thursday that it had closed on $70 million in a new round of financing Sports Beach Volleyball Rises in Shifting Sands of College Sports By MARC TRACY The presence of the sport in places like Georgia State shows how gender-equity requirements could be what's driving its growth. ON PRO BASKETBALL Knicks' Coaching Options Are Clear, Except Maybe to Phil Jackson By HARVEY ARATON Phil Jackson has some interesting choices as he ponders the question of naming the Knicks' next coach. Kentucky Derby 2016: Here's Who We Think Will Win By JOE DRAPE and MELISSA HOPPERT Joe Drape and Melissa Hoppert of The New York Times weigh in on the contenders for the 142nd running of the Kentucky Derby. Arts ART REVIEW Frieze New York, a Visual Circus Under the Big Top By HOLLAND COTTER This art fair's main value is shining light on unfamiliar galleries and art we might not otherwise see. ART REVIEW At the Costume Institute, Couture Meets Technology By ROBERTA SMITH "Manus x Machina" at the Metropolitan Museum of Art looks at how fashion and tech-savvy design go hand in hand. CRITIC'S NOTEBOOK The Composer Frederic Rzewski: In His Notes, Protest and Politics By ZACHARY WOOLFE This pianist-composer, a subtle but avowed leftist, is being celebrated at Bargemusic and elsewhere this week. Movies Review: In 'Captain America: Civil War,' Super-Bro Against Super-Bro By A. O. SCOTT "Captain America: Civil War" does not in any way transcend the conventions of the genre. On the contrary: it succeeds because it doesn't really try. Review: 'Dheepan,' About Sri Lankan Refugees, Looks Like a Prophecy By A. O. SCOTT In Jacques Audiard's Palme d'Or-winning film, the members of a makeshift family find that a housing project near Paris feels like the war zone they just left. Summer Movies Preview: 10 Trailers for May By ANITA GATES and MEKADO MURPHY Superheroes, politicians and a few angry birds are coming to the big screen this month.# New York ABOUT NEW YORK Remembering Daniel Berrigan: A Penniless, Powerful Voice for Peace By JIM DWYER Father Berrigan, whose funeral will be held on Friday in New York, opposed war, bigotry and abortion with a distinctly Catholic voice. 5¢ Fee on Plastic Bags Is Approved by New York City Council By J. DAVID GOODMAN The measure, which also covers paper bags, is intended to reduce their use; Mayor Bill de Blasio has expressed his support for it. Extreme Sailing to Meet Extreme Urban Conditions on Hudson By COREY KILGANNON Sailors will race "flying" catamarans off Lower Manhattan this weekend, and factor in skyscrapers and strong currents in a race that is part of the America's Cup series. Obituaries Kaname Harada, Pearl Harbor Fighter Pilot Who Became Pacifist, Dies at 99 By SAM ROBERTS Mt. Harada said it was not until the 50th anniversary of the airstrike that he learned the raid had been a sneak attack and that Japan had not declared war on the United States. Jean-Baptiste Bagaza, Deposed Leader of a Troubled Burundi, Is Dead at 69 By SEWELL CHAN As president of the small Central African nation, Mr. Bagaza invested in infrastructure but did little to make his country a stable democracy. Editorial EDITORIAL Safe Ways to Shorten Airport Security Lines By THE EDITORIAL BOARD Hiring more screeners and increasing enrollment in trusted traveler programs would go a long way to improve efficiency. EDITORIAL John Kasich Exits an Ugly Campaign Season By THE EDITORIAL BOARD Mr. Kasich, who believes in government, political compromise and substantive talk about issues, was rejected by Republican voters. EDITORIAL How New York Can Put an End to the Plastic Bag By THE EDITORIAL BOARD Measures that discourage the use of disposable bags, like a fee being considered by the New York City Council, are needed. Op-Ed OP-ED COLUMNIST The Donald Trump New Normal By GAIL COLLINS Maybe there will be a reality TV contest to pick a running mate. OP-ED | THOMAS B. EDSALL The Great Trump Reshuffle By THOMAS B. EDSALL The 2016 election will deepen the division between those who support the social and cultural revolutions of the past five decades and those who remain in opposition. ROOM FOR DEBATE Troubling Trademarks By registering a name that is offensive, would officials be approving a slur or doing their job to promote fair commerce