US President Donald Trump has criticized the current congressional hearings to launch measures to isolate him as a "farce" after the Trump administration stepped up confrontation with Democrats in Congress by preventing US Ambassador to the European Union Gordon Sundland from giving testimony as part of the The investigation into Trump's removal proceedings.
The ambassador had agreed to testify, but early yesterday morning, the State Department asked him not to come to testify.
"I would very much like to send the ambassador, Gordon Sundland, a very good man and a great American, to testify, but he will unfortunately testify before a court that is completely biased," Trump tweeted yesterday.
US authorities have taken security measures to protect the intelligence official who filed the report against Trump, sources said.