The White House has been engulfed in yet more controversy after the sacked FBI director James Comey claimed that Donald Trump asked him to shut down the Flynn investigation.
In an explosive memo, Mr Comey said that Mr Trump asked him to let go of the investigation into the links between Russia and his former national adviser Michael Flynn.
Mr Trump is not being impeached at the moment. But the latest scandal appears to be pushing him closer to the brink of impeachment as the mood darkens in Washington.
In a moment of high drama yesterday, Democratic congressman Al Green told Congress: “I rise… to call for the impeachment of the President of the United States for obstruction of justice.”
He claimed that as Mr Trump fired Mr Comey while “acknowledging” the investigation into Russia’s meddling in the election and possible contact with the Trump campaign.
Former FBI director Robert Mueller has been appointed as special counsel to oversee the investigation into Russia’s meddling in the election and possible contact with the Trump campaign.
In response Donald Trump tweeted: “With all of the illegal acts that took place in the Clinton campaign & Obama Administration, there was never a special counsel appointed!
“This is the single greatest witch hunt of a politician in American history!”
In order to face impeachment, the President needs to be accused of “treason, bribery, or other high crimes and misdemeanours”.
If the House of Representatives votes to impeach the President, then he gets impeached but is not expelled from office at this stage of the process.
There will then be an impeachment trial in the Senate where a two-thirds majority vote is needed to convict the president and remove him from office.
Both the House and the Senate are controlled by Republicans who are politically aligned with Mr Trump and unlikely to turn against him as yet.
The House has only impeached two presidents before – Andrew Johnson and Bill Clinton. Both were later acquitted in the Senate and stayed in office.
Richard Nixon resigned in order to avoid impeachment and expulsion from office in the wake of the Watergate scandal that rocked the White House.