Tyler Houlton, a spokesman for Homeland Security, FEMA's parent agency, referred questions to the inspector general's office, which didn't immediately respond to a request for comment.
Numerous Trump administration officials have been accused of improperly using taxpayer money and government resources for personal benefit. The investigation includes, but may not be limited to, travel using government resources, and that would include the administrator's travel in government vehicles on the taxpayer's dime, the source told CNN.
"What concerns me the most is trying to get to the people who didn't evacuate and that's incredibly hard to do, so we can't put our own people in danger", said administrator Brock Long, who spoke to CBS News right before he went to brief the president.
Since he took control of FEMA past year, Long has allegedly been using a government driver to take him home.
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Nalepa added that Long was now focused on FEMA's work "preparing for, responding to, and recovering from Hurricane Florence and other active tropical systems".
"All questions about any potential investigation by the Office of the Inspector General should be directed to the IG".
Long reportedly began having a government driver take him home since he took control of FEMA previous year.
"Bottom line is if we made mistakes in the way the program was run then we will work with the OIG to get those corrected". The administrator's trips home to North Carolina have also drawn the ire of his boss, DHS secretary Kirstjen Nielsen, who reportedly confronted him about them this summer.