Mark Esper has sworn in as the new US Defense Secretary in the presence of Donald Trump who nominated him, Report informs citing foreign media.

The Senate confirmed Mark Esper to be the next US Defense Secretary. Esper becomes the first individual to officially step into the role since former Defense Secretary James Mattis resigned in December over policy differences with the president. In the more than six months following Mattis’ resignation, three different men have served as defense secretary in an “acting” capacity.