Arnie Seipel

Arnie Seipel delivers weather forecasts five times daily on NPR Berlin. He is also a producer for NPR’s coverage of U.S. elections. Arnie previously worked as a production assistant with the promotions department at NPR, as well as the live events unit. He worked on NPR's Talk of the Nation before that.

Arnie’s career in broadcasting began at CBS News where he was an intern for CBSNews.com. He graduated from the University of Maryland with a degree in Government and Politics in 2008.

Hillary Clinton won today's Democratic primary in Puerto Rico, according to the Associated Press.

With about a quarter of precincts reporting, Clinton had about two-thirds of the vote. Vermont Sen. Bernie Sanders had about one-third.

The campaign of Sen. Bernie Sanders announced on Sunday that his campaign raised $26 million in April, fueled largely by small donations, a drop-off from the $46 million he raised in March and $42 million in February, according to the Federal Election Commission.

The slowing pace comes as the primary season heads into its final month, with Sanders practically out of reach of the Democratic nomination.

The Ted Cruz and John Kasich campaigns announced apparent coordinated strategies to combat Donald Trump in select upcoming primaries — an effort to force an open convention when the Republican National Committee gathers in Cleveland in July.

In a statement sent out Sunday evening, the Cruz campaign said it will focus resources on Indiana, "and in turn clear the path for Gov. Kasich to compete in Oregon and New Mexico."

After terrorist attacks in Brussels on Tuesday morning that killed more than 30 people and wounded more than 200, American politicians took to social media and TV news programs to respond to the violence.

Several pointed to the attacks as a reason to focus America's fight against Islamic extremism.

We're compiling responses from elected officials and presidential candidates here:

South Carolina Sen. Lindsey Graham is ending his bid for the Republican presidential nomination.

Graham tweeted the news, with a video of his announcement.

In an interview with CNN, Graham said, "I'm going to suspend my campaign. I'm not going to suspend my desire to help the country."

Updated at 5:45 p.m. ET

One of the suicide bombers who struck Paris on Friday has been identified as a Syrian who passed through Greece as an asylum-seeker this year and registered with European authorities.

That fact has spurred a strong reaction from many politicians here in the United States over the resettlement of Syrian refugees, with swift opposition from many Republican governors, and one Democrat, to further resettlement of Syrian refugees in their states.

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Transcript

SCOTT SIMON, HOST:

Security restrictions have gone into place across France and also here in the United States. NPR's Arnie Seipel has more.

Updated Sunday at 10:52 pm ET.

At a private meeting Sunday night, representatives from most of the Republican presidential campaigns agreed to negotiate directly with broadcasters who are sponsoring debates, pushing the Republican National Committee out of that role.

This has been the Summer of Trump on the campaign trail. Donald Trump has flown high in the polls, with seemingly nothing emerging to slow his rise.

But as heading into September, here are three hurdles the reigning Republican front-runner might have to contend with that run counter to his success so far:

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