Republican presidential candidate Donald Trump listens as Sam Clovis speaks at a press conference at the Grand River Center on August 25, 2015 in Dubuque, Iowa. Clovis recently quit his position as Iowa campaign chairman for Rick Perry.
Republican presidential candidate Donald Trump listens as Sam Clovis speaks at a press conference at the Grand River Center on August 25, 2015 in Dubuque, Iowa. Clovis recently quit his position as Iowa campaign chairman for Rick Perry.

Washington (CNN)Sam Clovis, a White House adviser on the US Department of Agriculture, is leaving the department, and his last day will be Friday, Politico has reported,