Mitch McConnell says post-polio syndrome caused a fall that left him briefly unconscious, followed by pneumonia, but his return date remains unclear.

Mitch McConnell says post-polio syndrome caused a fall that left him briefly unconscious, followed by pneumonia, but his return date remains unclear.

Sen. Mitch McConnell, 84, has been communicating by phone with colleagues as he recovers in the hospital from an undisclosed medical issue.