 He continued to lead TAC after its acquisition by Global Strategies Group in 2007 and its growth as the Global Intelligence Solutions division of Global's North American technology business GTEC, before returning to government service with the Obama administration as Homeland Security Advisor on January 20, 2009.On January 7, 2013, President Obama nominated Brennan to be director of the Central Intelligence Agency.On January 20, 2017, Brennan's CIA appointment ended, and he was replaced by President Trump's nominee Mike Pompeo on January 23, 2017.