Trump impeachment trial live updates: Biden says charge 'not in dispute' in 1st comments on acquittal

The former president's legal team argued that the increased "hatred" in politics has led to more incendiary political language and that the First Amendment protections must be applied evenly across all political language.

"Will the Senate then have to deal with constant articles of impeachment by a majority party accusing minority presidents or other elected officials of so-called 'inciteful' or false speeches?" Michael van der Veen said. "You can see where this would lead."

Van der Veen argued that Trump's speech and the speech of other politicians is protected by case law and the Constitution, and accused House managers of urging senators to ignore that.

"They astoundingly urge you to disregard your oath by ignoring the First Amendment of the Constitution. They also ignore landmark binding United States Supreme Court cases ... which unequivocally hold that elected officials have core First Amendment rights to engage in the exact type of political speech which Mr. Trump engaged in," van der Veen said.

Arguing Democrats are setting a "dangerous double standard," Trump attorney David Schoen played several mashup videos of notable Democratic figures calling for supporters to "fight" and clips of them questioning election results in years past, in an effort to paint Trump's rhetoric as normal political speech.

"Every single one of you and everyone of you, that's OK. You didn't do anything wrong. It's a word people use but please stop the hypocrisy," Schoen said.

Schoen argued that the Trump team was denied due process and that the reason for the impeachment is because of Democrats' strong dislike of Trump and the Republican Party.

"The House managers' position really is that when Republican candidates for office claim an election is stolen or the winner is illegitimate it constitutes inciting an insurrection and the candidate should know it. But Democratic Party candidates for public elected office are perfectly entitled to claim the election was stolen or that the winner is illegitimate or to make any other outrageous claim they can. It is their absolute right to do so," he said, pointing to claims around the 2016 election.

-ABC News' Allison Pecorin

When the chamber gaveled in, prayed and said the pledge on Friday, only 18 senators were in the chamber -- six of them Republicans. More flowed in as the proceedings began, but Senate Minority Leader Mitch McConnell was one of the last to arrive in the chamber at 12:12 p.m.

As Trump's lawyer Michael Van der Veen played footage showing Rep. Jamie Raskin, D-Md., objecting to the electoral college count in 2017, Raskin fiddled his thumbs. He seemed to notice the sound of his voice but didn’t look up at the screens immediately.

Republican senators appear much more alert compared to the past two days when the House impeachment managers presented their arguments. Many are taking notes and Sen. Rand Paul, R-Ky., has been particularly attentive today, seen chuckling several times, including when footage played showing Rep. Maxine Waters, D-Calif., challenging Electoral College results. He was also smiling and nodding as footage played of Democratic responses to protests over the summer.

On the other side of the chamber, some Democrats could be seen shaking their heads and whispering at times during the presentation. When Sen. Bernie Sanders, I-Vt., was mentioned in reference to the shooting of Rep. Steve Scalise, R-La., Sanders was seen fidgeting with the cuff of his shirt, leaned back in his chair and not taking notes.

After van der Veen finished his arguments, whispers broke out. Some Republican senators were nodding and giggling.

Reporters inside the Senate chamber noted that as David Schoen was talking, only three Republican seats were empty and almost all of senators were paying close attention. Sen. Bill Cassidy, R-La., continued to take notes, as he has throughout the trial.

When Schoen brought up what he alleged was manipulation of exhibits by House impeachment managers, lead House manager Raskin began scribbling in his notepad furiously. 

-ABC News' Trish Turner

Trump attorney David Schoen argued there's a "dangerous double standard" being applied by Democrats, many of whom have sought to impeach Trump ever since, he said, they were angered by his election in 2016.

"That same hatred and anger has led House managers to ignore their own words and actions and set a dangerous double standard. The House managers spoke about rhetoric, about a constant drumbeat of heated language," Shoen said. "Though I'm sure everyone watching expected, we need to show you some of their own words."

He went on to play a series of video of notable Democrats, including Vice President Kamala Harris, House Speaker Nancy Pelosi and Sen. Elizabeth Warren, D-Mass., calling for supporters to "fight" -- in an effort to paint Trump's words at the Jan. 6 rally as normal political speech.

Celebrities Madonna and Johnny Depp also made appearances in the video exhibit from Trump's defense team for their criticisms of the former president with Madonna saying at a political event, "I have thought an awful lot about blowing up the White House."