Stepien received the test results on Friday evening and suffers from the symptoms described by the official as “mildly flu-like”.
Stepien was one of a group of senior Trump campaign workers who were tested, but he’s the only one whose results have been positive so far. Deputy Campaign Manager Justin Clark’s test results were negative.
Prior to the reorganization, Stepien was a deputy for Parscale and previously held a senior role in Trump’s administration as political director of the White House.
He took part in Trump’s first presidential campaign in August 2016, making him the first addition since Conway as campaign manager at the time and former top Trump adviser Steve Bannon as CEO at the time.
Trump adviser Jared Kushner recruited Stepien to join the Trump campaign, and the two are close. A source with knowledge of the hiring told CNN at the time that Bannon was a key player in Stepien’s recruitment.
As national director of John McCain’s 2008 presidential campaign and political director of New Hampshire in the re-election of President George W. Bush in 2004, Stepien brought a lot of campaigning experience to Trump’s mission. But he has also controversially discussed Trump’s first run.
Stepien was campaign manager and deputy chief of staff for New Jersey Gov. Chris Christie, a close confidante and advisor to Trump. But Christie fired Stepien in January 2014 amid the Bridgegate scandal in which Christie workers ordered lanes to be closed on the George Washington Bridge in political retaliation.
This story has been updated with additional details.
CNN’s Maegan Vazquez, Jeremy Diamond and Jim Acosta contributed to this report.