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.

Democrat Andy Kim was sworn in Monday as New Jersey's newest U.S. senator. He vowed to fight for Americans' dreams.