investigate his political rival. the rudy giuliani, soviet born, conspired to remove the ambassador from the post by funneling foreign money to a u.s. congressman to buy his influence. the former ambassador's interview is still going on behind closed doors right now. we weren't sure whether the ambassador would show up today after the state department announced it would block employees from testifying in the impeachment and query. another key witness is the ambassador to the european union. he says he will defy the trump administration's orders and testify himself next week after house democrats issued a subpoena. gordon's son could be critical to determine whether president trump withheld military aid to ukraine in order to pressure that country to launch an investigation into his rival joe biden. the president said there was no