Mr. Trump, who has focused his ire on Mr. Schiff amid the burgeoning Ukraine scandal, wasted no time in trying to use the revelation about the whistle-blower’s attempt to alert Congress to try to denigrate his complaint. In a news conference in the East Room of the White House after this article was published, Mr. Trump called it a scandal that Mr. Schiff knew the outlines of the whistle-blower’s accusations before he filed his complaint.