There are so many questions about the Trump impeachment hearings: will the Democrats call more witnesses? Is the evidence enough to impeach the president? Will it sway voters in the general election? And why was this man smiling? Gordon Sondland turned out to be the star witness of the week. A Trump campaign donor who is also US ambassador to the European Union and seemed almost congenial in crucifying everyone who played a role in that July phone call between the president and his Ukrainian counterpart.