Robert F. Kennedy Jr. ‘s bid to be the nation’s top health official is uncertain after a key Republican joined Democrats to raise concerns over the nominee's skepticism of childhood vaccinations.

Pilots, lawmakers and aviation experts have been sounding the alarm about Ronald Reagan National Airport for a while.

Lawmakers have lobbied to add flights, while pilots have complained about the presence of military and other aircraft.

Va., discusses the devastating collision between a Black Hawk helicopter and a regional jet in D.C. on ’Special Report.’ ...