WASHINGTON (AP) — Prosecutors in Donald Trump’s impeachment trial said Wednesday they would prove that Trump was no “innocent bystander” but the “inciter in chief” of the deadly attack at the Capitol aimed at overturning his election loss to Joe Biden.

Opening the first full day of arguments, the lead House prosecutor promised to lay out evidence that shows the president encouraged a rally crowd to head to the Capitol, then did nothing to stem the violence and watched with “glee" as a mob stormed the iconic building. Five people died.

“To us it may have felt like chaos and madness, but there was method to the madness that day,” said Rep. Jamie Raskin, D-Md.

The day's proceedings were unfolding after an emotional Tuesday start to the trial that left the f ormer president fuming when his attorneys delivered a meandering defense and failed to halt the trial on constitutional grounds. Some allies called for yet another shakeup to his legal team.

Trump is the first president to face an impeachment trial after leaving office and the first to be twice impeached. The riot followed a rally during which Trump urged his supporters to “fight like hell,” words his lawyers say were simply a figure of speech. He is charged with “incitement of insurrection.”

Senators, many of whom fled for safety the day of the attack, watched Tuesday’s graphic videos of the Trump supporters who battled past police to storm the halls, Trump flags waving. More video is expected Wednesday, including some that hasn’t been seen before.

The prosecutors are arguing that Trump’s words weren't just free speech but part of “the big lie” — his relentless efforts to sow doubts about the election results. Those began long before the votes were tabulated, revving up his followers to “stop the steal" though there was no evidence of substantial fraud.

Trump knew very well what would happen when he took to the microphone at the outdoor White House rally that day, almost to the hour that Congress gaveled in to certify Biden’s win, said Rep. Joe Neguse, D-Colo.

“This was not just a speech,” he said.

Trump’s supporters were prepped and armed, ready to descend on the Capitol, Neguse said. “When they heard his speech, they understood his words.”

Security remained extremely tight Wednesday at the Capitol, fenced off with razor wire and patrolled by National Guard troops.

White House press secretary Jen Psaki said Biden would not be watching the trial.

“Joe Biden is the president, he’s not a pundit, he’s not going to opine on back and forth arguments,” she said.

The difficulty facing Trump's defense team became apparent at the start of the trial as they leaned on the process of the trial, unlike any other, rather than the substance of the case against the former president.

As the House impeachment managers described police officers maimed in the chaos and rioters parading in the very chamber where the trial was being held, Trump’s team countered that the Constitution doesn’t allow impeachment at this late date.

Even though the Senate rejected that argument in Tuesday's vote to proceed to the trial, the legal issue could resonate with Senate Republicans eager to acquit Trump without being seen as condoning his behavior.

On Tuesday, lead defense lawyer Bruce Castor said he shifted his planned approach after hearing the prosecutors’ emotional opening and instead spoke conversationally to the senators, saying Trump’s team would denounce the “repugnant” attack and “in the strongest possible way denounce the rioters.” He encouraged the senators to be “cool headed” as they assessed the arguments.

Trump attorney Schoen turned the trial toward starkly partisan tones, arguing the Democrats were fueled by a “base hatred” of the former president.

Republicans made it clear that they were unhappy with Trump’s defense, many of them saying they didn’t understand where it was going — particularly Castor’s opening. Louisiana Sen. Bill Cassidy, who voted with Democrats to move forward with the trial, said that Trump’s team did a “terrible job.” Maine Sen. Susan Collins, who also voted with Democrats, said she was “perplexed.” Sen. Lisa Murkowki of Alaska said it was a “missed opportunity” for the defense.

Six Republicans joined with Democrats to vote to proceed with the trial, but the 56-44 vote was far from the two-thirds threshold of 67 votes that would be needed for conviction.

At one pivotal point on Tuesday, Raskin told his personal story of bringing his family to the Capitol that day to witness the certification of the Electoral College vote, only to have his daughter and son-in-law hiding in an office, fearing for their lives.

“Senators, this cannot be our future,” Raskin said through tears. “This cannot be the future of America.”

The House prosecutors had argued there is no “January exception” for a president to avoid impeachment on his way out the door. Rep. Neguse referred to the corruption case of William Belknap, a war secretary in the Grant administration, who was impeached, tried and ultimately acquitted by the Senate after leaving office.

If Congress stands by, “it would invite future presidents to use their power without any fear of accountability," he said.

It appears unlikely that the House prosecutors will call witnesses, and Trump has declined a request to testify. The trial is expected to continue into the weekend.

Trump's second impeachment trial is expected to diverge from the lengthy, complicated affair of a year ago. In that case, Trump was charged with having privately pressured Ukraine to dig up dirt on Biden, then a Democratic rival for the presidency.

This time, Trump's “stop the steal” rally rhetoric and the storming of the Capitol played out for the world to see.

The Democratic-led House impeached the president swiftly, one week after the attack.