take the helm
verb2
Broadly, Figuratively To take over responsibility (of something) from someone else.
- The nation was also at peace. The Cold War had ended before Bill Clinton took the helm, and his presidency had experienced nothing that could be called a major international crisis. Turmoil in the Balkans and Middle East was nothing new. Iraq required attention but no massive deployment of Americans. There had been devastating, but fortunately isolated, terrorist attacks in Africa and in Oklahoma City. But the North Koreans had not invaded South Korea, nor had they lobbed one of their missiles in our direction. Communist China did not invade Taiwan. Libya remained quiet.2001, Barbara Olson, “The Final Frenzy: Finishing Touches on the Legend”, in The Final Days: The Last, Desperate Abuses of Power by the Clinton White House (Politics/Current Affairs), Washington, D.C.: Regnery Publishing, →ISBN, →LCCN, →OCLC, page 2: