The White House has slammed the door in a letter on Tuesday on any cooperation by President Donald Trump's administration with the Democrats' impeachment probe, calling it "constitutionally invalid."
The eight page letter to Democratic leaders, rejected the entire process underway in the House of Representatives, which is examining whether Trump abused his office by seeking a corruption probe in Ukraine of 2020 election rival Joe Biden.
The White House said it objected especially to the fact that the lower house had not held a formal vote to launch the impeachment inquiry.