NEW: Treasury Sec. Mnuchin responds to request for President Trump's tax returns, saying dept. will not be able to complete review by request date: "The Committee's request raises serious issues concerning constitutional scope of Congressional investigative authority"

NEW: Treasury Sec. Mnuchin responds to request for President Trump's tax returns, saying dept. will not be able to complete review by request date: "The Committee's request raises serious issues concerning constitutional scope of Congressional investigative authority" pic.twitter.com/klZx74ECH6

— NBC Politics (@NBCPolitics) April 10, 2019