Former President Joe Biden took a parting shot at President Donald Trump before departing Washington, D.C., for California and embarking on his life as a private citizen.

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In a farewell speech at Joint Base Andrews, attended by former Secretary of State Antony Blinken and his White House chief of staff Jeff Zients, Biden encouraged his aides to remain engaged, whether it be in the public or private sector.

“We’ve a lot more to do,” Biden told the crowd Monday. “We heard the inaugural address today. We have a lot more to do.”

Biden then gestured the sign of the cross during remarks in which he expressed his gratitude on behalf of himself and former first lady Jill Biden after four years in the White House but half a century in Washington. He added, “It’s been the honor of my life to serve as your president,” but “the greater honor is being able to serve with all of you.”

“We’re leaving office, but we’re not leaving the fight,” he said. “You’re smart, you’re skilled, you’re passionate. Stay engaged in all the ways you can. I give you my word. We believe in you.”

Joe Biden sat behind Trump during his inaugural address inside the Capitol Rotunda and smirked at times as Trump described the last four years under a Democratic Party-controlled White House in dark terms.

In a not-so-subtle shot at Joe Biden, Trump said, “From this moment on, America’s decline is over.”

Joe Biden implored his aides to take some time to decompress and reconnect with their families and friends before reengaging and “upholding core values.”

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“No president gets to choose the moment they enter history,” the 46th president said. “But they get to choose the team they enter history with.”

He continued, “Mark my words: History is going to judge what you’ve done as the most significant contributions that’s been made for all of America.”