top of the hour this wednesday. i'm jim sciutto. >> and i am erica hill. right now several key hearings happening on capitol hill. a pretty busy day in washington. this hour lawmakers will grill active administrator billy nolan after multiple close calls on the runway and some of the aviation incidents sparking safety concerns. also federal reserve chairman jerome powell appearing before lawmakers for the second day defending his decisions to raise interest rates in an effort to tamp down inflation. we're also watching the top u.s. intelligence officials testify, among them fbi director chris wray, the director of national intelligence avril haynes as what they see the biggest global threats facing the u.s. today. cnn's melanie is live on capitol hill today. several events and several bits of testimony on the hill today. walk us through what you're watching. >> yeah. a very busy day here on capitol