First Lady Melania Trump attended a conference at the Thomas Jefferson University Hospital where she met with mothers and newborn babies who have been affected by the opioid crisis in the United States.
In August, President Donald Trump joined his wife to tour Nationwide Children's Hospital in Columbus, Ohio, and visit with NAS medical professionals.
It is not clear yet what caused the problem. The White House has not yet provided an official, specific explanation about the incident. FLOTUS is still going to Philadelphia later today, on a different plane, said Grisham.More news: Mayweather says Nurmagomedov fight will happen
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The first lady, Health and Human Services Secretary Alex Azar and others on the trip were transferred to a second plane, the reporters' statement said.
About 10 minutes after takeoff, some Secret Service officers were seen heading toward the front of the plane. Smoke began to fill the plane, and journalists on board reported a burning smell growing stronger.
The plane landed safely at Andrews shortly after 9 a.m. ET.
"Smell and smoke have since dissipated", NBC's Peter Alexander tweeted.