US President Donald Trump has said, American forces have captured a key militant, Mustafa Al-Imam, believed to have involved in the deadly attack on the US Consulate in Benghazi, Libya in 2012. <br/><br/>Four Americans, including a diplomat named Christopher Stevens, were killed in the attack. The mission was approved by President Trump.<br/><br/>The Justice Department, in a statement, said Al-Imam is in US custody in Libya, and upon his arrival to the US, he will be presented before a federal judge in Washington.<br/><br/>