Health hazards have emerged as a bitter point for many people in the agency, where sources describe an increased sense of anxiety and anger because they are placed on what some consider to be an unreasonable risk. One agency source said there was “increased anger and frustration” among some at the Secret Service over what they considered “unnecessary travel and exposure” because of Trump and Pence’s trip.

“Even passionate Trump supporters are fed up,” said one agency source. “We signed up to take a bullet for him, we didn’t register to get sick for him for no apparent reason.”

In addition to agents who became ill, many more had to be quarantined after making contact with other people who tested positive, putting pressure on the number of agencies because Trump and Pence continued to schedule trips throughout the country. Each trip requires several teams of agents, who work in turns to ensure proper rest.

White House spokesman Judd Deere said the President “takes the health and safety of all those who travel to support himself and all White House operations very seriously.”

“When preparing and carrying out any trip, White House Operations work closely with Doctors to the President and the White House Military Office, to ensure plans include current CDC guidelines and best practices to limit COVID-19 exposure as far as possible,” he said in a statement.

In the agency, some people wondered how important the trip was carried out by Trump and Pence, especially the source of the campaign event previously explained to CNN as a means to improve the mood of the President.

Pence’s recent trips have all focused on coronaviruses – including in the Sun Belt countries where cases are soaring – and aides say it is important that the vice president get a direct view of the crisis.

The vice president’s office did not immediately return CNN’s request for comment.

“President Trump wants me to be here to tell you and the Arizona people that we are with you,” Pence said Wednesday when he met with the governor of the state. “We will make sure you have what you need, when you need it, to fulfill this moment.”

But Pence’s trip also had the effect of lending urgency to the pandemic response that Trump alleges had alternately damaged and ignored. And before that Pence communicated widely with the governor through teleconferences.

The tasks required by agents often complicate federal guidelines on social distance, even though the agency says they are trying to protect the safety of their employees.

“The health and safety of our workforce, their families and the people we protect remains a top priority for the agency,” Secret Service communications director Catherine Milhoan said in a statement. “The agency continues to operate in accordance with the recommendations of the Centers for Disease Control and Prevention through the US Secret Service Office for the Safety, Health and Environment Program.”

At least eight Secret Service agents assigned to Pence details ahead of his trip to Arizona this week tested positive for the corona virus just before the vice president was scheduled to travel there, law enforcement sources told CNN.

It is unclear whether there is any overlap with agents from Tulsa and Phoenix.

Positive tests force a one-day delay in travel so the Secret Service can exchange in healthy teams – Pence has been scheduled to go to Arizona on Tuesday, but instead travels on Wednesday. Ahead of Pence’s trip, the state reported record highs for new daily cases and deaths since the country began posting data to the public in mid-March.

After testing positive, agents were quarantined at a hotel in Phoenix, said people who were aware of the problem. Some symptoms and are being treated by doctors, although do not require hospitalization, said the source.

Pence’s trip initially included several more public stops, including in Yuma, but the trip was scaled back amid a recent surge in the Covid case in Arizona. While there, Pence received directions and the latest information from local officials and did not leave the airport.

That happened more than a week after Trump’s march in Oklahoma, which disappointed the President because of the low number but kept pushing many cases among his staff and the details of the Secret Service.

Although the number of publicly released agents who tested positive while working at the Tulsa rally was two, sources familiar with the matter say the actual number is closer to 15.

Secret Service agents were tested in Tulsa on June 19, one day before the rally, and those who tested positive received the results within 48 hours – meaning some or all could be on the rally itself without knowing that they had tested positive. All were tested again in Washington six days after the rally.

To avoid aircraft, agents who tested positive drove back to their bases – including Dallas and Houston – to enter quarantine for at least 14 days. Agents tested negative from Tulsa are also required to quarantine at home for 14 days; most have now been cleared to return to work soon after this weekend.

In addition to Secret Service personnel, a number of Trump’s campaign staff tested positive for coronavirus while working at the Tulsa rally. Many campaign officials entered quarantine after the event as a precaution. All were tested again a few days after the general meeting.

CORRECTION: This story has been corrected to reflect that not everyone who pre-shows goes through a Secret Service agent.