Stephen Colbert challenges Alex Trebek to trivia face-off

Alex Trebek has been sporting a beard lately, and "Late Show" host Stephen Colbert is not happy about it. Colbert, who has also grown out his facial hair, says there's only room for one "Colbeard" on TV, and has challenged the "Jeopardy!" host to a trivia face-off.On Tuesday's "Late Show," Colbert announced the challenge after Trebek showed off his new beard on the season premiere of "Jeopardy!" on Monday. He played a clip of Trebek talking about his new look and joking that his mustache hairs "