Topics and Guests, April 23

Today on "Special Report":

North Korea (search) formally requests international help for train disaster that killed at least 150 people — We'll have a full report.

GUEST PREVIEW: We'll get answers about the U.S. Patriot Act from Deputy Attorney Gen. James Comey.

Catherine Herridge reports: A long awaited court ruling is handed down in the case of the alleged 20th hijacker -- What does it mean? We'll have answers.

Carl Cameron reports: John Kerry takes heat from the Vatican while he rallies for abortion rights. We'll have a full report.

James Rosen reports: Bush travels to Florida, meanwhile his administration eases sanctions on Libya. Find out the details.

Molly Henneberg reports: Should one Sept. 11 commissioner be providing answers instead of questions? Find out why some senators say yes.

Details on those stories and more on Special Report with Brit Hume at 6 p.m. ET.

— Guests and topics are subject to change