The White House has officially refused to co-operate with the impeachment inquiry against President Donald Trump.
A letter sent to Democratic leaders rejected it as “baseless” and “constitutionally invalid”.
Three Democratic-led House committees are investigating Mr Trump.
The inquiry is trying to find out if the president held back aid to Ukraine to push it to investigate Joe Biden, who is running for the Democratic presidential nomination.
Meanwhile, House Intelligence Committee Chairman Adam Schiff (D-CA) says that the blocking of Amb. Gordon Sondland’s testimony and withholding of documents will be viewed as obstruction of Congress