US President Donald Trump has posted an enraged Tweet aimed at the investigators in his ongoing impeachment inquiry.
Trump called House intelligence committee chairman Adam Schiff "corrupt" and instructed his Republicans to "keep fighting tough" as "you are dealing with human scum".
He also said Schiff's lies were "growing by the day" and is facing "the most unfair hearings in American history".
The inquiry is focused on a phone call in July during which Trump is accused of asking Ukraine's President Volodymyr Zelensky to carry out two corruption investigations to benefit him politically.
One of them targeted Democratic rival Joe Biden and his son Hunter.
The other was into a discredited theory that it was Ukraine, not Russia, who meddled in the 2016 election, reports Reuters.
It's alleged Trump threatened to withhold $391 million in military aid to Ukraine if Zelensky refused him.
If Trump is formally charged, the inquiry will lead to a trial in the Senate, which will decide whether he is removed from office.
