The Nebraska Republican Party on Monday called for GOP state Sen. John McCollister to re-register as a Democrat after he accused the party of enabling white supremacy in the United States.

“John McCollister has been telegraphing for years that he has little if nothing in common with the Republican voters in his district by consistently advocating for higher taxes, restrictions on American’s Second Amendment rights, and pro-abortion lobby,” Nebraska Republican Party Executive Director Ryan Hamilton said in a statement. “His latest false statement about Republicans should come as no surprise to anyone who is paying attention, and we’re happy he has finally shed all pretense of being a conservative.”

.@SenMcCollister should tell the truth and change his party registration. pic.twitter.com/qrC2XOpoxk — NEGOP (@NEGOP) August 5, 2019

Hamilton added that he'd be "happy to send a change of voter registration form along to his office so he can make the switch officially and start, for once, telling the truth to voters in his district.”

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McCollister gained national attention on Sunday after sharing a series of tweets condemning the Republican Party for what he described as its complicity in "obvious racist and immoral activity inside our party."

"The Republican Party is enabling white supremacy in our country," McCollister said on Twitter. "As a lifelong Republican, it pains me to say this, but it’s the truth."

The thread from McCollister, who was first elected to the state Senate in 2014, came in the hours after mass shootings in El Paso, Texas, and Dayton, Ohio, left more than 30 people dead.

What I am saying though is that the Republican Party is COMPLICIT to obvious racist and immoral activity inside our party. — Senator McCollister (@SenMcCollister) August 5, 2019

The alleged shooter in El Paso is believed to have posted a racist, anti-immigrant manifesto on the fringe online message board 8chan before carrying out the attack on Saturday. Many Democratic lawmakers have drawn a link between the manifesto and President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's divisive rhetoric on immigration.

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McCollister made a similar argument, arguing that the president "continually stokes racist fears in his base."

"He calls certain countries 'sh*tholes,' tells women of color to 'go back' to where they came from and lies more than he tells the truth," he said. "We have Republican senators and representatives who look the other way and say nothing for fear that it will negatively affect their elections. No more. When the history books are written, I refuse to be someone who said nothing."

He concluded his thread by calling on lawmakers to act like former President Lincoln and "take a stand."

We all like to cite Abraham Lincoln’s Republican lineage when it is politically expedient but NOW is the time to ACT like Lincoln and take a stand. pic.twitter.com/Yk32capM4C — Senator McCollister (@SenMcCollister) August 5, 2019

McCollister did not immediately respond to a request for comment on the Nebraska GOP's statement from The Hill.

Trump on Monday called for the entire nation to condemn hate and white supremacy while addressing the mass shootings in El Paso and Dayton. He added that federal law enforcement would receive adequate support in order to crack down on the threat of white nationalists and domestic terrorism.