Republicans are 'Feckless Cowards,' Says Former McCain Adviser as He Leaves Party Over Trump Border Policy

He was once the campaign manager for Senator John McCain's 2008 bid for the White House. Now, he's left the party.

GOP strategist Steve Schmidt renounced his membership in the Republican party early Wednesday morning, saying he will now align with Democrats. Schmidt took to Twitter in a long series of tweets to make his announcement.

While the longtime Republican has not been shy about criticizing the Trump administration, the move comes as a surprise from someone who managed the campaign of a GOP presidential nominee 10 years ago.

Schmidt said his decision was a direct result of the administration's policy of separating children from parents who illegally cross the border. In recent weeks, Republican politicians across the country have slammed Trump and the Justice Department's "zero-tolerance" policy, evan as the president continues to claim, incorrectly, that it's the result of laws passed by Democrats."

Related: Republicans slam child separation policy as Trump blames Democrats ​

The 29-year-veteran of the Republican party and current MSNBC analyst said the policy is "immoral and must be repudiated."

"This child separation policy is connected to the worst abuses of humanity in our history," Schmidt wrote on Twitter. "It is connected by the same evil that separated families during slavery and dislocated tribes and broke up Native American families."

Calling the GOP now a "danger to our democracy and values," Schmidt said the party is corrupt, indecent and immoral, adding that it's filled with "feckless cowards who disgrace and dishonor the legacies of the party's greatest leaders."

He also took aim at the current leadership of the GOP, Speaker of the House Paul Ryan and Senate Majority Leader Mitch McConnell, for allowing a child separation policy that "establishes internment camps for babies."

"[Ronald Reagan] would be ashamed of McConnell and Ryan and all the rest while this corrupt government establishes internment camps for babies," Schmidt wrote. "They have disgraced their country and brought dishonor to the Party of Lincoln."

In the series of tweets in which Schmidt renounced his party, he used the final one to say that he will now be aligned with Democrats and vote for them in future elections.

"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," he said. "That party is the Democratic Party."