"In light of the provisions of the executive order, I direct you and your staff to honor all immigration detainer requests received from the Department of Homeland Security," Gimenez instructed Miami-Dade County Corrections and Rehabilitation Director Daniel Junior in the memorandum on Thursday.
Gimenez is a Republican, but has said he voted for Democrat Hillary Clinton against victorious Republican presidential candidate Donald Trump in the November 8 election, the Miami Herald reported.
On Wednesday, Trump announced a new executive order that threatened to withhold federal grant funding from any county or city defying US law by trying to protect illegal immigrants as a "sanctuary" territory.
Miami-Dade County is due to receive $355 million from the federal government in its 2017 budget, the report noted.
President Donald Trump praised via Twitter on Thursday evening the decision by Gimenez.