OFF TO THE RACES: Mind the age gap
CLINTON: The New York Times looks at her appeal with older Democrats.
Her team's playbook, via the Washington Post: "Given Trump's willingness to attack his opponents — and his pivot to going after Clinton in recent days — one clear presumption has emerged about the fall contest: It will be ugly. That's one reason the former secretary of state plans to counter Trump with high-road substance, policy and issues, according to one senior campaign aide. The idea is to showcase what Clinton's backers see as her readiness for the job without lowering her to what they describe as Trump's gutter."
She will use her speech at AIPAC to slam Donald Trump.
CRUZ: He's telling Arizona voters "a vote for Kasich is a vote for Trump."
SANDERS: Democratic lawmakers are pushing him to call it quits, POLITICO reports.
He's been pushing for investment in solar energy during his Arizona swing.
TRUMP: NBC's Ali Vitali reports on Donald Trump's visit to Washington DC today, which includes a meeting with GOP officials and a speech to AIPAC.
After a weekend of confrontations at his rallies, Trump asked: "At what point do people blame the protesters?"
His team denies that campaign manager Corey Lewandowski grabbed a protester at a rally in Tucson on Saturday.
The New York Times on his relationship with news outlets, writing that the GOP frontrunner is "taking advantage of a momentous and insecure time in American media."
The Washington Post traces the Republican Party's embrace of trade expansion and how it helped foster Trump's rise.
He has invested a total of nearly $25 million in his campaign to date, while supporters have given about $9.5 million.
He'll lose badly in Utah's caucuses, POLITICO notes.
Reince Priebus acknowledged over the weekend that the RNC is preparing for the possibility of a contested convention.
OBAMA AGENDA: Hola, Cuba
The president has begun his historic visit to Cuba.
The Associated Press: "Brushing past profound differences, President Barack Obama and Cuban President Raul Castro will sit down Monday at Havana's Palace of the Revolution for a historic meeting, offering critical clues about whether Obama's sharp U-turn in policy will be fully reciprocated."
The New York Times: "[H]ours before Air Force One landed at José Martí International Airport, the challenges inherent in normalizing relations with a Communist police state were laid bare, as dozens of arrests were made at the weekly march of Ladies in White, a prominent dissident group. The protest, which takes place most Sundays outside a suburban church here, was widely seen as a test of Cuba's tolerance for dissent during the presidential trip, and the arrests confirmed that Cuba was maintaining its long history of repressive tactics, if not intensifying their reach."
Writes the Wall Street Journal: "Mr. Obama and Raúl Castro will meet Monday for events that include a state dinner and statements to the media. It was unclear if the White House would succeed in convincing Mr. Castro to take questions from reporters, which U.S. officials see as a potentially powerful statement on the Cuban government's restriction of political freedoms."
Conservatives are still working to agree on a message in the fight to block Supreme Court nominee Merrick Garland.