What Biden said following Trump's inauguration

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on Monday.

which delivered a sharp criticism of the Biden administration while outlining Trump's plans upon taking office again.

"We have a lot more work to do. We heard the inaugural address today," Biden said in his remarks at Joint Base Andrews before boarding a plane with former First Lady Jill Biden.

"We've got a lot more work ahead of us," Biden continued, before making the sign of the cross to laughter.

The former president advised his staff members to remain involved, in either a public or private role, in academia, or by running for office themselves.

We're vacating our office, but we're not stepping down from the battle," Biden said. "You're intelligent, you're accomplished, you're driven and the nation requires your presence again.

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He explained that his dad taught him that a person is measured by how swiftly they can bounce back after experiencing setbacks.

That's what we have to do right now. We've always done our best as Americans. We never, never, never give up, ever.

He expressed a hope that his staff will look back on the past four years with "the same feeling of pride that I have for all you've accomplished."

He said you set a great example, upholding values of honesty, decency, and integrity, and that you truly represent the best qualities that Americans hold dear.

Biden also expressed feeling hopeful that his term wouldn't be overturned.

As with the laws we've passed, our seeds will flourish and yield results for years to come, he said.

MORE: Trump inaugural address: Scathing attack on Biden's "horrible betrayal" and vision for a "Golden Age"

He expressed his appreciation for his team and their families and the opportunity to serve alongside them.

I've been doing this for 50 years, you're the best group of people," Biden said, receiving applause. "It's been the greatest honor of my life to serve as your president.

He referenced Seamus Heaney's poem, "The Cure at Troy," noting, "Once in a lifetime, the longed-for tidal wave of justice will rise up and hope and history will rhyme."

He's said with emphasis, 'You've brought back rhyming to a level we haven't seen in a long time,' and went on to declare, 'We're on the verge of actual progress, so let's help make hope and history sound good together.'