AILSA CHANG, HOST:
The acting head of the Defense Department is now under investigation by the department's internal watchdog. Before Patrick Shanahan became - came to the Pentagon, he spent three decades at Boeing, working his way up to become a senior executive. Now he is accused of promoting Boeing even as he assumed leadership of the Pentagon.
NPR Pentagon correspondent Tom Bowman joins us now with the details of the investigation. Hey, Tom.
TOM BOWMAN, BYLINE: Hey, Ailsa.