WASHINGTON – Rep. Joe Kennedy III will challenge incumbent Ed Markey for the Senate and seek to restore the Kennedy legacy in the upper chamber, the Boston Globe reported.

Kennedy, 38, is the grandson of former New York Sen. Bobby Kennedy and the grand-nephew of President John F. Kennedy and former Massachusetts Sen. Ted Kennedy.

Kennedy will formalize his long-rumored Massachusetts Senate Democratic primary run at a breakfast with supporters Saturday at East Boston Social Centers, the paper reported.

Kennedy has been a congressman from Massachusetts since 2013.

Markey, 73, served in the US House for more than three decades, starting in 1976. He succeeded John Kerry in 2013 when President Obama named Kerry secretary of State.

Markey has been a leader on tackling climate change and has the endorsement of New York Rep. Alexandria Ocasio-Cortez.