Republican strategist Steve Schmidt, one of the GOP's loudest critics of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, renounced the party early Wednesday and announced that he will begin voting for Democrats.

Schmidt slammed Trump in a Twitter thread, saying he was leaving the party that once ended slavery.

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“29 years and nine months ago I registered to vote and became a member of The Republican Party which was founded in 1854 to oppose slavery and stand for the dignity of human life,” Schmidt tweeted.

“Today I renounce my membership in the Republican Party. It is fully the party of Trump,” he added.

29 years and nine months ago I registered to vote and became a member of The Republican Party which was founded in 1854 to oppose slavery and stand for the dignity of human life. Today I renounce my membership in the Republican Party. It is fully the party of Trump. — Steve Schmidt (@SteveSchmidtSES) June 20, 2018

The GOP has become “corrupt, indecent and immoral,” Schmidt added.

It is corrupt, indecent and immoral. With the exception of a few Governors like Baker, Hogan and Kasich it is filled with feckless cowards who disgrace and dishonor the legacies of the party’s greatest leaders. This child separation policy is connected to the worst abuses of — Steve Schmidt (@SteveSchmidtSES) June 20, 2018

He specifically referenced the Trump administration’s "zero tolerance" policy for illegal border crossings, which has led to the separation of parents and children during prosecution proceedings.

“This child separation policy is connected to the worst abuse of humanity in our history,” Schmidt wrote. “It is connected by the same evil that separated families during slavery and dislocated tribes and broke up Native American families. It is immoral and must be repudiated. Our country is in trouble. Our politics are badly broken.”

He also ripped Republican congressional leadership, including Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) and Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.), for allowing the U.S. government to establish “internment camps for babies.”

On Ronald Reagan’s grave are these words. “ I know in my heart that man is good. That what is right will always eventually triumph and there is purpose and worth to each and every life.” He would be ashamed of McConnell and Ryan and all the rest while this corrupt government — Steve Schmidt (@SteveSchmidtSES) June 20, 2018

Establishes internment camps for babies. Everyone of these complicit leaders will carry this shame through history. There legacies will be ones of well earned ignominy. They have disgraced their country and brought dishonor to the Party of Lincoln. — Steve Schmidt (@SteveSchmidtSES) June 20, 2018

“Everyone of these complicit leaders will carry this shame through history. There legacies will be ones of well earned ignominy. They have disgraced their country and brought dishonor to the Party of Lincoln,” the strategist wrote.

Schmidt, a former aide to Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.) and an MSNBC analyst, has been a vocal critic of the Trump administration and his immigration policies.

He said Wednesday that the “GOP has become a danger to our democracy and values.”

I have spent much of my life working in GOP politics. I have always believed that both parties were two of the most important institutions to the advancement of human freedom and dignity in the history of the world. Today the GOP has become a danger to our democracy and values. — Steve Schmidt (@SteveSchmidtSES) June 20, 2018

“This Independent voter will be aligned with the only party left in America that stands for what is right and decent and remains fidelitous to our Republic, objective truth, the rule of law and our Allies. That party is the Democratic Party,” Schmidt wrote.

Schmidt called for a blue wave to bring back Democratic majorities in the midterm elections later this year.

“I do not say this as an advocate of a progressive agenda. I say it as someone who retains belief in DEMOCRACY and decency,” Schmidt said.

Season of renewal in our land is the absolute and utter repudiation of Trump and his vile enablers in the 2018 election by electing Democratic majorities. I do not say this as an advocate of a progressive agenda. I say it as someone who retains belief in DEMOCRACY and decency. — Steve Schmidt (@SteveSchmidtSES) June 20, 2018

Schmidt is not the first Republican to condemn the party under the leadership of Trump.

Former GOP Rep. Charles Djou (Hawaii) announced in March that he was leaving the Republican Party due to Trump’s “hostile” immigration practices.

Former Speaker John Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE (R-Ohio) said earlier this month that the GOP has been completely taken over by Trump.

“There is no Republican Party. There’s a Trump party. The Republican Party is kinda taking a nap somewhere," Boehner said.