ATLANTA, GA – OCTOBER 05: A podium with the logo for the Centers for Disease Control and Prevention at the Tom Harkin Global Communications Center on October 5, 2014 in Atlanta, Georgia. The first confirmed Ebola virus patient in the United States was staying with family members at The Ivy Apartment complex before being treated at Texas Health Presbyterian Hospital Dallas. State and local officials are working with federal officials to monitor other individuals that had contact with the confirmed patient. (Photo by Kevin C. Cox/Getty Images) A sudden change in federal guidelines on coronavirus testing came this week as a result of pressure from the upper ranks of the Trump administration, a federal health official close to the process tells CNN. “It’s coming from the top down,” the official said of the new directive from the Centers for Disease Control and Prevention. The new guidelines raise the bar on who should get tested, advising that some people without symptoms probably don’t need it — even if they’ve been in close contact with an infected person. Previously, the CDC said viral testing was appropriate for people with recent or suspected exposure, even if they were asymptomatic. CDC would not comment on questions about its own policy change. A CDC spokesperson referred all questions to the Department of Health and Human Services. In a statement to CNN, HHS Assistant Secretary Brett Giroir said: “This Guidance has been updated to reflect current evidence and best public health practices, and to further emphasize using CDC-approved prevention strategies to protect yourself, your family, and the most vulnerable of all ages.” HHS has not specified what change in “current evidence” may have driven the change. Giroir is expected to address these issues at a briefing Wednesday afternoon. But the new directive also lines up with a trend in policy and rhetoric from the White House. President Donald Trump has repeatedly suggested the US should do less testing. Dr. Carlos del Rio, an infectious disease specialist and associate dean of Emory University School of Medicine, said on CNN Newsroom on Wednesday that the CDC has not provided evidence to explain the changes. “I mean, the evidence that I’m aware of as of today is that close to 40% of the cases of the infections are asymptomatic and asymptomatic people transmit the infection,” Del Rio said. “So, not testing — I mean, if you have been in contact with somebody for a few minutes, that’s okay. But if you have been in contact for 50 minutes and that people doesn’t have a mask, I think you need to be tested regardless if you have symptoms or not. We know especially young people going into the house and then transmit inside the household. So, the guidelines baffle me and I really don’t understand them.” This story is breaking and will be updated.