Special counsel to oversee criminal investigations into Donald Trump

An independent lawyer has been appointed to oversee the US justice department's criminal investigations into former President Donald Trump.

Jack Smith, a former war crimes prosecutor, was named special counsel by Attorney General Merrick Garland in a news conference.

He will lead investigations into how Mr Trump handled classified documents and his alleged role in the Capitol riot.

Mr Trump, who is the subject of several other inquiries, denies any wrongdoing.

Mr Smith will ultimately decide whether the former Republican president, who announced his 2024 candidacy just three days ago, will face criminal charges.

"In certain extraordinary cases it is in the public interest to appoint a special prosecutor to independently manage an investigation and prosecution," Mr Garland said on Friday.

"Due to recent developments, including the former president's announcement that he is a candidate in the next election, and the sitting president's intention to be a candidate as well, I have concluded that it is in the public interest to appoint a special counsel."

He said the move would give the public confidence in the investigation.

Mr Smith is a former prosecutor in New York and most recently served a chief prosecutor in the Hague where he investigated war crimes in Kosovo.

He will be returning to the US to begin his work immediately, Mr Garland said.

Merrick Garland's decision to appoint a special counsel indicates that this administration is painfully aware that these cases involve the highest of political stakes.

A move by Joe Biden's justice department to charge a man who could be facing off against him in the 2024 presidential general election would be viewed by as much as half the country as suspicious, regardless of any assurances of impartiality.

Handing this off to a special counsel, and giving that counsel power to do as he sees fit, provides the Biden administration at least a measure of insulation against such allegations.

It also suggests the justice department believes there is sufficient evidence to prosecute Mr Trump, as a case without merit could have been simply abandoned without action.

All this is serious business for Mr Trump and his closest allies, just days after he launched his third bid for the White House.

Special counsel inquiries tend to take on lives of their own, and find new prosecutorial avenues to explore, as did Robert Mueller's Russia probe and similar investigations during the George W Bush and Bill Clinton presidencies.

Mr Garland has set in motion a whirlwind whose ultimate course will be difficult to predict.