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.

Drew Angerer/Getty Images

Republican presidential nominee Donald Trump is shaking up his campaign staff, after a series of missteps that led to slumping poll numbers.

Trump has tapped Stephen Bannon of Breitbart News to serve as chief executive of the campaign. Pollster Kellyanne Conway was promoted to campaign manager. Paul Manafort will stay on as Trump's campaign chairman. The Wall Street Journal first reported the news.

"I have known Steve and Kellyanne both for many years," Trump said in a statement. "They are extremely capable, highly qualified people who love to win and know how to win."

Bannon has been in charge of Breitbart News for a period in which it has been a strong platform for the kind of populism and fierce opposition to illegal immigration that gave rise to Trump's candidacy in the Republican primaries. A campaign release highlighted that Bloomberg Politics has called Bannon the "most dangerous political operative in America."

Evan Vucci/AP

Editor's note: NPR will also be fact-checking Democratic nominee Hillary Clinton's planned economic speech this Thursday.

Donald Trump is coming off a week of disastrous headlines and cratering poll numbers. His major economic speech on Monday at the Detroit Economic Club, a vision described by his campaign as "Winning the Global Competition," was a chance to turn the page.

During an address of just over an hour — which was interrupted multiple times by protesters — the GOP presidential nominee unveiled a new iteration of his proposal to reshape America's tax system. It has just three tax brackets (one fewer than the tax plan he released in September, which was removed from his website in the past 24 hours), would limit taxes on all forms of business income to 15 percent, would end the estate tax and would "exclude childcare expenses from taxation."

Other highlights include a proposed moratorium on all new federal regulations and would "remove bureaucrats who only know how to kill jobs [and] replace them with experts who know how to create jobs," according to a preview released by his campaign. It's unclear exactly what that means or how it would work, but there are currently about 2.7 million civilian federal employees.

A man who was arrested at a Donald Trump rally in Las Vegas on Saturday after reportedly trying to grab a police officer's gun intended to "shoot and kill" the Republican presidential nominee, according to court documents released on Monday.

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:

Former Secretary of State Colin Powell has a message for the Republican Party: "We have to become more respectful of each other."

Speaking on the death of former first lady Nancy Reagan, Powell said he believed she would be "disturbed" by the way her husband's legacy is invoked by some people today. Powell spoke in an interview with NPR's Michel Martin on All Things Considered.

Just seven candidates will take the main stage for the next Republican presidential debate, on the Fox Business Network on Thursday evening — the fewest of any GOP debate so far in the 2016 campaign.

Businessman Donald Trump, Texas Sen. Ted Cruz, Florida Sen. Marco Rubio, Dr. Ben Carson, New Jersey Gov. Chris Christie, former Florida Gov. Jeb Bush and Ohio Gov. John Kasich will battle it out in the main event in Charleston, S.C.

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.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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.

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:

President Obama wants to close the prison at the U.S. Navy base at Guantanamo Bay before leaving office. But his departing defense secretary, Chuck Hagel, told NPR News the job is "going to be very difficult" to complete in that time.

Hagel made that remark in an exit interview Friday, one of only a handful he granted as he prepared to vacate his expansive office at the Pentagon. The interview will air Monday on Morning Edition.

This story is part of the New Boom series on millennials in America.

Pages