President-Elect Trump Expected to Pick Gen. John Kelly as Nominee for DHS Secretary

— -- President-elect Donald Trump is expected to nominate Gen. John Kelly for secretary of Homeland Security, according to two top transition officials familiar with the decision.

Kelly is a retired four-star general and the former commander of U.S. Southern Command. In addition to his experience leading troops overseas, he is known for his strong knowledge of border issues and the drug trade in South and Central America.

Kelly lost his son Marine 1st Lt. Robert Kelly in an IED explosion in Afghanistan in 2010.

Trump and Kelly last met at Trump Tower on Nov. 30. His office did not immediately respond to ABC News' request for comment.