we start in the nation's capital. the big day ahead in the democrats' impeachment inquiry prompted by a whistle-blower's accusation that president trump pressured ukraine to dig up dirt on the biden family in exchange for military aid. >> in just a few hours the u.s. ambassador to the european union, gordon sondland, will testify behind closed doors to three house committees -- intelligence, foreign affairs, oversight. sondland was mentioned in the whistle-blow whistle-blower's complaint and game attention in text messages released by the house democrats. >> in the texts sondland asked bill taylor to talk to ukraine's president and soond land suggested that would lead to a meeting between president trump and the president of ukraine. sondland rejected taylor's characterization of that arrangement as a quid pro quo. senior congressional reporter manu raju. >> good morning, dave and christine. another key witness in the ukraine scandal coming to capitol hill, gordon sondland,