Former Governor of Maryland and onetime Democratic presidential contender Martin O'Malley has been prolific on Twitter lately, responding to President-elect Donald Trump's feud with Democratic Rep. John Lewis (Ga.) with some surprising characterizations.

O'Malley, who left the governorship in 2015 to run in the presidential primaries on the Democrat ticket, has been referring to the incoming Trump administration with allusions to Nazi Germany and the Ku Klux Klan.

The feud between Lewis, a civil rights icon, and Trump began with Lewis declaring that he did not consider the president-elect to be "legitimate" and that as a result, he would not be attending the inaugural ceremonies on Friday.

Trump hit back on Twitter, accusing Lewis of neglecting his "crime infested" district and being "all talk, no action."

O'Malley is apparently backing Lewis and the other Democrats who have thrown their support in by refusing to attend the inauguration. Those include Reps. Raúl Grijalva (D-Ariz.), Barbara Lee (D-Calif.), Katherine Clark (D-Mass.), Luis Gutiérrez (D-Ill.) and Jared Huffman (D-Calif.). CNN reported Saturday that the list of Democrats boycotting the inauguration is growing.

O'Malley was recently rallying Democrat troops in Utah — a traditionally red state that publicly vacillated between Trump and write-in conservative Evan McMullin in the 2016 election:

O’Malley told Good4Utah, “The Democratic Party needs to re-build. And the time to do that is right now. And that sort of rebuilding won’t take place in Washington, it'll take place in Salt Lake City, It’ll take place in Utah. It’ll take place in states across the United States.” He says the power of political parties seems to ebb and flow and Utah won't always be an all red state.

O'Malley also prominently displayed his Tweet comparing Trump and his supporters to Nazis on the home page of his website.