"He yelled a lot," said Kristin Urquiza. "I can't help but think people were exposed to the virus."
RELATED: SF woman whose father died of COVID-19 describes attending debate as Biden's guest
Urquiza, a San Francisco native, was sitting a mere 15 feet away from the president at the Cleveland debate hall -- two days before he tested positive for COVID 19.
"We have no idea how much virus he put out into the air with his performance and that is what scares me the most," she said.
The risk of exposure hits home, especially for Urquiza. She recently lost her father, Mark, to COVID-19.
READ MORE: 'Fatigued' Trump, stricken by COVID-19, arrives at Walter Reed military hospital
"I've seen firsthand through the loss of my dad the darkest result of COVID... which is an undignified and lonely death," said Urquiza.
She remembers staring at a picture of her father she brought with her Tuesday night.
RELATED: Trump's COVID-19 diagnosis may affect the election in several ways
"I was thinking of him," she said. "But, it was hard knowing the entire Republican side of the debate hall wasn't even wearing masks."
Urquiza said President Trump's children and First Lady Melania Trump were all not wearing face coverings during the debate.
"It was like the Wild Wild West...there was absolutely no enforcement," she said.
"How concerning is that to you?" Sierra asked.
"I'm terrified," she said. "I really am."
Urquiza is in the process of getting tested and will be self-quarantining, just like the president and first lady.
MORE: Shock, sympathy, mockery: World reacts to President Trump's COVID-19 infection
"I'm saddened," said John Dennis, the chairman of the San Francisco Republican Party.
"I'm concerned for the president given his age."
Dennis lost his father, Bill Dennis, to COVID-19 at age 89.
"He was dead within 72 hours and it just went right through him," Dennis said. "He had underlying issues and that was not a good combination."
After seeing the impact, Dennis said he expects the next 72 hours could be critical for the president.
"How fast it happened... it just went boom like that," he said. "I hope that they make it through this."
Editorial note: On Sunday, Urquiza told ABC7 News she tested negative for COVID-19. She plans to finish her 14 day quarantine to be safe.
SEE ALSO: Trump defends 'playing down' COVID-19 after new book reveals president called virus 'deadly stuff' in Feb
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