Miles Taylor was once a Trump administration political appointee at the Department of Homeland Security from 2017 to 2019.
He also served a chief of staff to then-Homeland Security Secretary Kirstjen Nielsen.
Now, CNN reports Taylor has endorsed presumptive Democratic nominee Joe Biden in his presidential campaign.
One of the highest-ranking former Trump administration officials to do so, Taylor endorsed Biden in a video produced by Republican Voters Against Trump.
In the video, Taylor accuses Trump of directing FEMA to withhold disaster funding to California following devastating wildfires in that state.
Taylor claimed Trump's reason for doing so was that California voters hadn't voted for him for President.