Biden's decision to pardon his son became a 'weapon' for Trump - media.

US President Joe Biden decided to pardon his son Hunter, transferring him from prosecution and prison because he was concerned about his fate.

This caused outrage and criticism from Trump, who also threatened to investigate Biden and his family.

The US Constitution grants the president the power to pardon and to decline to prosecute individuals accused of crimes against the country.

Biden decided to use this power because he feared that prison could ruin Hunter's changed life after he fell in love with his new wife and had a child.