president trump continuing to stonewall house democrats in their investigation efforts. the white house sending a scathing letter to nancy pelosi and house committees refusing to cooperate. calling the impeachment inquiry illegitimate and unconstitutional. pelosi sending her own strongly worded warning writing, mr. president, you are not above the law. you will be held accountable. the president is obstructing congress from getting the facts that we need. it is an abuse of power for him to act in this way. and that is one of the reasons that we have an impeachment inqui inquiry. reporter: the war or words heating up after the white house blocked gordon sondland from appearing before house committees on tuesday. his attorney writing in a statement, ambassador sondland is profoundly disappointed that he will not be able to testify. house democrats immediately