Chafee, who has begun actively fundraising as an anti-war candidate in the aftermath of the Trump administration's decision to kill a top Iranian general, is set to announce his campaign in Washington, D.C. on Wednesday.

"Lincoln leads with truth," according to the candidate's fundraising pitch.

Chafee is set to unveil his latest political run at 10 a.m. Wednesday at the National Press Club in Washington.

“As the lone senator who bucked his party to vote NO on the Iraq War authorization, it sickens me to think that the lies of administrations past have turned into the ongoing problems we face today. We must work towards an America at peace with the world, and end these senseless and counterproductive wars,” Chafee said in a statement.

Chafee ran for president as a Democrat in 2016, but never attracted much support and folded his campaign.

Chafee and his wife Stephanie relocated from Rhode Island to Wyoming and he previously signaled a possible Libertarian run. His 2016 campaign came in for some ridicule (due in part to Chafee's quirkiness in highlighting such issues as the metric system).

Chafee's campaign manager, Christopher Thrasher of Providence, described the candidate as a principled alternative to politics as usual.

While Democrats may worry that a well-known Libertarian could draw votes away, helping to re-elect President Trump in November, "Voting for the lesser of two evils is still evil and it's imperative that the American people have a chance to vote for candidates that actually will stand up to end the wars," Thrasher said. "It is imperative that the American people have an option, a real option, and not just the tired old partisan politics, and the Democrats and the Republicans."

The son of former U.S. Sen. John Chafee, Lincoln Chafee was appointed to fill the remainder of his father's term after John Chafee died in 1999.

Lincoln Chafee won the seat in 2000. Six years later, in 2006, the then-Republican lost it the Senate seat to Democrat Sheldon Whitehouse, even though Chafee remained well-liked with Rhode Islanders at the time.

Chafee went on to win a narrow election for governor as an independent in 2010, but he decided against seeking re-election amid low approval ratings. He became a Democrat during his time as governor.

This report has been updated.