JUST IN: Schiff suggests that a supplemental letter provided by a Pence aide — which the VP's office won't declassify — "raises profound questions" about Pence's knowledge of Trump's effort to get Ukraine to launch investigation.

JUST IN: Schiff suggests that a supplemental letter provided by a Pence aide — which the VP's office won't declassify — "raises profound questions" about Pence's knowledge of Trump's effort to get Ukraine to launch investigation. pic.twitter.com/BJL1mu4IIv

— Kyle Cheney (@kyledcheney) December 17, 2019