Andy Kim will officially begin his term as U.S. senator on Monday, starting three weeks early. New Jersey Gov. Phil Murphy appointed Kim to the Senate on Sunday, following the certification of his election victory in November.

New Jersey's newest U.S. Senator was formally sworn in Monday afternoon. Sen. Andy Kim won the seat previously held by Bob Menendez during the election last month and will finish the last two weeks of Menendez’s term in accordance with vacancy laws.

Andy Kim took the oath of office Monday around 5 p.m. on a newly-purchased Bible from the National Cathedral in Washington.