Don Jr., Ivanka, Eric, and Tiffany Trump didn't wear masks during the president's showdown with Joe Biden, breaking the venue's rules

President Donald Trump's family members did not wear masks during his debate on Tuesday with the Democratic nominee, Joe Biden, defying the rules of the event.

Trump's children were pictured wearing masks as they approached their seats, but they took them off for the debate itself.

A Bloomberg reporter at the debate said first lady Melania Trump took off her mask after sitting down. She did not wear one on stage, while Jill Biden did.

Photos showed that people in the audience who were there to support Biden wore masks for the event.

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Many supporters of President Donald Trump, including his children, did not wear masks while they sat in the audience on Tuesday for his first debate with the Democratic nominee, Joe Biden, violating the guidelines for the event.

Four of Trump's children — Ivanka, Donald Jr., Eric, and Tiffany — sat in the front row and did not wear masks.

First lady Melania Trump was pictured wearing one while sitting with them. But Tyler Pager, a Bloomberg News political reporter at the event, said she removed her mask after she sat down.

The Trump family members were seen wearing masks while they approached their seats, and they removed them later.

The seats were set far apart to adhere to social-distancing guidelines.

Ivanka Trump and Donald Trump Jr. walking into the venue. JIM WATSON/AFP via Getty Images

Guests were told to wear masks throughout the debate, held at Case Western Reserve University in Cleveland, Ohio.

NBC News reported that a Cleveland Clinic doctor tried to approach the Trump children to ask them to wear masks as they entered the venue but that she ultimately couldn't get to them.

Pager also said a doctor at the event told him that unmasked audience members on Trump's side of the room refused to take a mask when offered one.

NBC News also reported that some members of the Trump administration who were there were not wearing masks.

Peter Eyre, a senior adviser for the Commission on Presidential Debates, told Cleveland's WJW news station before the event: "There are things we're doing differently this year that we haven't done before because of COVID-19. That includes a variety of testing, social distancing, mask wearing and obviously reducing the total number of people who will be involved."

People who were there to support Biden appeared to wear masks while seated, The Daily Beast reported.

This photo shows people on that side of the room wearing masks and Eric Trump not wearing one:

Many supporters of Joe Biden wore masks during the debate. Eric Trump, the only Trump child visible in this photo, isn't wearing one. Olivier Douliery-Pool/Getty Images/Business Insider

Biden's wife, Jill Biden, wore a mask to greet her husband on stage after the debate, while Melania Trump did not.

Donald Trump Jr. told the Fox News host Sean Hannity after the debate that he had been tested for the virus and joked that he would face backlash for not wearing a mask unless he clarified that.

Eyre had said before the debate that all audience members would be screened for the virus. There was no suggestion that testing negative was a reason not to wear a mask.

Biden used the debate to attack Trump's handling of the coronavirus pandemic. "He's been totally irresponsible the way he's handled social distancing and discouraging people to wear masks," Biden said.

Photos from Trump's indoor campaign rallies have shown many attendees not social distancing or wearing masks.

More than 200,000 people in the US have died from the coronavirus, according to data from Johns Hopkins University. The US has the highest coronavirus death toll in the world.