Impeachment prosecutors at Donald Trump's Senate trial Wednesday aired terrifying, never-before-seen footage of senior US politicians fleeing for their lives during last month's assault on Congress, a riot they argued was deliberately incited by the former president.

With painstaking, graphic presentations, Democratic impeachment managers walked senators -- many of them clearly shaken -- through hours of video, some of which came from security cameras and police bodycams and was being aired for the first time.

Donald Trump Impeachment
House impeachment managers walk through the Rotunda in the Capitol on Tuesday Photo: POOL / Win McNamee

The aim was to remind senators, and watching Americans, just how bad January 6 got when a mob stormed the US Capitol after Trump told a rally near the White House that his failure to win reelection was due to vote rigging.

The ensuing mayhem left five people dead, including one woman shot after she invaded the Capitol and one policeman killed by the crowd.

Republican Senator Bill Cassidy
Republican Senator Bill Cassidy voted that the impeachment trial was constitutional Photo: POOL / Chip Somodevilla

Video played on the Senate floor showed then-vice president Mike Pence -- who was in the Capitol to preside over certification of Joe Biden's defeat of Trump -- being hurried down back stairs to safety by security officers, along with his family.

Top Democratic Senator Chuck Schumer is seen narrowly dodging a rampaging throng of pro-Trump rioters. And Senator Mitt Romney, a Republican who often opposed Trump and was turned into a hate figure by the president, is seen being steered away by an officer at the last moment as an angry crowd approaches.

US Capitol
National Guard soldiers remain on duty on Capitol Hill protecting US lawmakers after the deadly unrest on January 6 Photo: AFP / Brendan Smialowski

In another segment, the mob can be seen smashing into the offices of Nancy Pelosi, speaker of the House of Representatives and another frequent target of Trump's most violent rhetoric.

"Nancy, where are you Nancy?" protesters call out as they search, not knowing that eight of her staff were barricaded behind a door in the same corridor. Pelosi herself had already been urgently evacuated.

David Schoen, lawyer for Donald Trump
David Schoen, lawyer for former President Donald Trump, argued that the Senate had no jurisdiction to try Trump once he had left office and warned that the impeachment threatened to "tear this country apart" Photo: POOL / Andrew Harnik

"We know from the rioters themselves that if they had found Speaker Pelosi, they would have killed her," said impeachment manager Stacey Plaskett, a House delegate from the US Virgin Islands.

Trump's defense lawyers, who will present their arguments later this week, say Trump can not be personally blamed for the riot and that the entire trial is unconstitutional because he has already left office.

Donald Trump
Donald Trump remains popular and powerful among Republicans despite leaving the presidency Photo: AFP / ANDREW CABALLERO-REYNOLDS

But over several hours, impeachment managers laid out their case that the links are clear between Trump, his lies about election fraud, the violence, and the then-president's inaction as the riot unfolded.

"The vice president, the speaker of the house -- the first and second in line to the presidency -- were... put in danger because president Trump put his own desires, his own need for power, over his duty to the constitution and our democratic process," said Plaskett.

Trump Impeachment
Democratic impeachment managers head to the Senate where former president Donald Trump is on trial Photo: AFP / Eric BARADAT

"President Trump put a target on their backs, and his mob broke into the Capitol to hunt them down."

Lead impeachment manager Jamie Raskin said Trump "completely abdicated" his duty.

"Donald Trump surrendered his role as commander-in-chief and became the inciter-in-chief of a dangerous insurrection," Raskin said.

Impeachment Trial
Before the second day of Donald Trump's Senate trial, a screen shows images of a police officer trapped by a pro-Trump mob at the US Capitol Photo: AFP / Brendan Smialowski

Holed up in his luxury Mar-a-Lago club in Florida, Trump has been gone from power for three weeks.

But the trial has put the flamboyant and deeply polarizing Republican once more at the center of the national conversation -- and underlined his still-powerful hold over the base of the Republican electorate.

Some Republican senators have expressed disgust with the pro-Trump riot, openly blasted Trump's refusal to accept defeat to Biden, and acknowledged the compelling case made by the Democrats with the aid of extensive video -- an unprecedented development on the Senate floor.

"The evidence that has been presented thus far is pretty damning," Republican Senator Lisa Murkowski said.

"Of course it's powerful," Senator Bill Cassidy, who with Murkowski was among six Republicans in supporting the trial's constitutionality, said of the chilling footage. But "how that influences final decisions remains to be seen."

It is highly unlikely that enough Republicans will join the Democrats to secure conviction in the impeachment trial.

This requires a two-thirds majority, meaning 17 Republicans would need to go along with the 50 Democrats.

Forced off Twitter and other social media platforms following his unprecedented attempt to foment a conspiracy theory about his election defeat, Trump has fewer outlets where he can vent.

But it is also believed that advisors are pressing him to keep back, fearing his reappearance could turn Republican senators against him.

They get another chance beginning Thursday, with 16 hours allotted to each side.

Unlike Trump's first impeachment trial a year ago, which took three weeks, this one is expected to be over within days.

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