Special counsel Robert Mueller has ended his 22-month long probe into possible Russian collusion in the 2016 Presidential elections which saw Donald Trump come to power as the 45th President of the United States.

The investigation into possible Russian interference in Trump's 2016 Presidential run has seen charges being filed against 37 defendants, seven guilty pleas and one conviction.

Barr may provide the US Congress with "the special counsel's principal conclusions as soon as this weekend."

Meanwhile, a Justice Department official has labelled the report as "comprehensive".

"The next steps are up to Attorney General Barr, and we look forward to the process taking its course. The White House has not received or been briefed on the Special Counsel's report," White House Press Secretary Sarah Sanders tweeted.

The incumbent US President has often decried Mueller's investigation as a "witch-hunt" and asked for the probe to be scrapped. He is yet to respond to the investigation's cessation.

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