Congress formally certified Joe Biden as the next US president on Thursday, dealing a hammer blow to Donald Trump whose supporters stormed the Capitol hours earlier,  triggering unprecedented scenes of mayhem in the seat of American democracy.

Lawmakers in the Senate and House of Representatives successfully beat back Republican efforts to deny Biden the electoral votes needed to win, prompting loud cheers when the certification was announced.

The affirmation of Biden's 306-232 victory over Trump in November essentially closes the door on the unparalleled and deeply controversial effort by Trump and his loyalists to overturn the results of the 2020 election.

The president immediately released a statement pledging an "orderly transition" but suggesting he would remain in frontline politics, amid speculation that he may run again in 2024.

Text and video: AFP

Multimedia editor: Yuliasri Perdani