Don Gonyea

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Bernie-mania hit Vatican City today with a crush of Italian media, cameras, boom microphones, shouting reporters and a ring of civilians, smartphones held aloft, chanting "Bernie, Bernie, Bernie!"

Sanders was not there to meet with Pope Francis, who is on the road himself visiting a refugee camp in Greece. The Democratic hopeful had accepted an invitation from the Pontifical Academy of Social Sciences to speak at a conference on social and economic justice.

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After "Make America Great Again," it is perhaps the most common refrain of the Donald Trump campaign.

"I will build a wall!"

And, every time, it's followed by an ironclad guarantee from the candidate:

"And I will make Mexico pay for it."

When asked how, Trump has always been short on details. He cites leverage the U.S. has over Mexico, which needs access to the U.S. market. He has also suggested steep tariffs on Mexican-made goods.

Democratic presidential hopefuls Hillary Clinton and Bernie Sanders have agreed to hold another debate in advance of the New York primary. The candidates have committed to face each other on CNN at 9 p.m. on April 14 in New York, the network says.

The very important New York primary takes place on April 19.

Each of their campaigns had a hard time coming up with a date and venue the other side would accept, and each insisted it was the other side that was holding things up.

Wisconsin holds its primary on Tuesday — it's a key state with 42 delegates at stake on the GOP side. Ted Cruz has been gaining strength in the state, where and after lagging at first, he's now leading Donald Trump in polls.

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NPR's Don Gonyea is in Michigan, one of the states voting for presidential candidates today.

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: Thank you.

>>INSKEEPIn this country, tomorrow, South Carolina holds it's Democratic primary. It's a chance for Hillary Clinton to benefit from her lead among African-American voters. Here's NPR's Don Gonyea.

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