EXCLUSIVE-US armed drone program in Yemen facing intelligence gaps

(Adds White House comment) By Mark Hosenball, Phil Stewart and Matt Spetalnick WASHINGTON, Jan 29 (Reuters) - The United States is facing increasing difficulty acquiring intelligence needed to run its stealth drone program in Yemen, undermining a campaign against the most lethal branch of al Qaeda after Houthi rebels seized control of parts of the country's security apparatus, U.S. officials say. Gaps in on-the-ground intelligence could slow America's fight against a resurgent al Qaeda in Yemen