Especially since 9/11, there have been concerns that terrorists could use such devices. The Government Accountability Office recently conducted an undercover investigation to try to acquire radioactive materials using fake credentials.
Amtrak's Acela Express trains will get new tracks, new train cars, and improved platforms to bring higher-speed train service to Boston, New York, and DC.
McCain is facing off against Kelli Ward, a conservative 33 years his junior, in today's Arizona state primary.
Spokespeople from Donald Trump's campaign quickly and explicitly disavowed a robocall from David Duke linking the former Ku Klux Klan leader to the Republican presidential nominee.