Former White House chief of staff Mark Meadows said on the stand that he maintained a "general awareness" of efforts following the 2020 presidential election to investigate allegations of fraud, but he added that there are some things he has only learned recently.

Meadows was asked about a meeting at the White House in December 2020 where Attorney General William Barr said he would resign. Meadows recalled that the meeting was about election-related allegations concerning fraud and election irregularities. He testified that Barr told then-President Donald Trump a lot of the election claims "had no merit" and that "some of it, to use his terms, was 'bulls---.'"

Meadows said he attended a meeting in the Oval Office with Michigan state legislators over allegations of potential fraud in his "official capacity as chief of staff" because he needed to be able to advise Trump.

-ABC News' Nadine El-Bawab

Former White House chief of staff Mark Meadows said on the stand Monday that his role involved setting up meetings and communications with various agencies and states.

Meadows said his role was to be in almost every meeting the president had, and he described his role as more difficult than he could have imagined. He described the time after the 2020 election as more than he could handle.

-ABC News' Riley Hoffman

The hearing began shortly after 10 a.m. with the defense calling Mark Meadows to the stand.

The defense went over Meadows' duties as chief of staff and assistant to former President Donald Trump.

On the stand, Meadows said it was his role to "oversee all the federal operations, not just in the West Wing, but beyond that."

Meadows also said the job was difficult in light of the pandemic, calling it "challenging times."

"There was a political component to everything that we did," Meadows said in describing the intersection between policy and politics inside the Trump White House in the chaotic closing days of the administration.

Meadows, wearing a royal blue suit, white shirt and pale blue tie in court, said he attended meetings as a principle and sometimes as an observer.

Meadows said he would "certainly meet with state officials" as part of his job.

At least one attorney for Trump, Jennifer Little, was spotted in the overflow room listening to the proceedings.

-ABC News' Nadine El-Bawab and Aaron Katersky

Fulton County, Georgia, Superior Court Judge Scott McAfee has scheduled the plea hearings and arraignments for all 19 defendants alleged to have conspired to overturn the 2020 election for Wednesday, Sept. 6.

The arraignments are staggered over 15-minute intervals, beginning with former President Donald Trump at 9:30 a.m. and concluding with Misty Hampton at 3 p.m.

Former chief of staff Mark Meadows' appearance is scheduled for 10:30 a.m.

-ABC News' Peter Charalambous

Mark Meadows testified that the Hatch Act does apply to the White House chief of staff, but he said “there are some differences of opinion on how it should apply.”

Meadows insisted that when it comes to his interactions with people connected to Donald Trump's campaign, including Georgia Secretary of State Brad Raffensperger, he said, "I didn't [see ] that as a violation of the Hatch Act."

The Hatch Act limits the political participation and speech of federal employees.

-ABC News' Mike Levine