Sen. Cory Booker (D-N.J.) urged Americans not to “curl up, give up or shut up” in an emotional Facebook post published the morning of President-elect Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s inauguration.

“This is not a time to curl up, give up or shut up,” Booker wrote. “It is time to get up; to stand up, to speak words that heal, help, and recommit to the cause of our country.”

In a historic move, Booker recently testified against Trump’s nominee for attorney general, Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (R-Ala.). Booker became the first sitting senator to testify at a confirmation hearing against another senator. Many speculated Booker’s decision to testify against Sessions could have been a first move toward a potential 2020 presidential bid.

“We had an election defeat, but we are not defeated,” Booker wrote. “We hurt, we fear, we may even regret that we did not do more. But character is not defined, forged or built in good times. The fire of adversity forges our steel.”

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Booker said he would not join the nearly 60 Democratic lawmakers who will boycott Trump’s inauguration Friday. These Democrats are breaking with tradition after a divisive election. Many made the decision following Trump’s attacks on Rep. John Lewis (D-Ga.), after Lewis said he does not believe Trump is a “legitimate president.”

Booker will attend the inauguration, along with other Democratic colleagues, President Obama and Trump’s Democratic challenger Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE.

In his message, Booker urged Americans not to “surrender” or “forfeit” their values despite Trump’s imminent presidency.

“But let us never, ever, surrender, forfeit, or retreat from our core values, our fundamental commitments to justice over prejudice; economic inclusion over poverty and unmerited privilege; and, always, love over hate,” Booker continued. “Let us speak truth to power; fiercely defend those who are bullied, belittled, demeaned or degraded; and tenaciously fight for all people and the ideals we cherish.

“It is a new day. We love our country; we will serve it, defend it, and never stop struggling to make its great promise real for all. And no one gets a vote on that.”