On NPR's through line, witnesses were ending up dead.

How the hunt for gangster Al Capone launched the IRS to power.

Find NPR's ThruLine, wherever you get your podcasts.

Live from NPR News in Washington, I'm Jack Spear. President Trump says the U.S. will soon begin

construction on a new missile defense shield. As NPR's Jeff Bromfield explains, the schedule

and cost projection are ambitious. From the Oval Office, President Trump laid out his plans for a

Golden Dome missile shield that would be capable of stopping an attack from anywhere. Once fully

constructed, the Golden Dome will be capable of intercepting missiles, even if they are launched

from other sides of the world, and even if they're launched from space. Trump says the shield can be built in just three years and will cost around $175 billion.

Experts say that timeline is extremely ambitious and the price tag could end up being a lot higher.

One recent estimate from the Congressional Budget Office suggests even a basic defense could cost half a trillion dollars.

Jeff Brumfield, NPR News.

Secretary of State Marco Rubio was on Capitol Hill today where he defended the Trump administration's

foreign policy, including the slashing of U.S. foreign assistance, reductions in refugee

admissions, and other changes. Rubio and some democratic lawmakers

also sparred over administration policies in Ukraine and Russia, as well as the Middle East and Latin America.

Rubio claimed four months of foreign policy achievements for the administration, though some remain

inconclusive, such as nuclear talks with Iran and efforts by Trump to bring Russia and Ukraine to the

table for peace talks. The IRS has churned through four acting commissioners over the past

four months. NPR Scott Horsley reports the Senate Finance Committee held a confirmation hearing

today for a man who could get the permanent job. Former Missouri Congressman Billy Long is

President Trump's pick to lead the IRS. It's a tumultuous

...