Earlier today, Senator Mitt Romney, R-UT., betrayed the Republican Party that once named him as their presidential nominee when he voted in favor of convicting Donald Trump on impeachment charges. He was the only GOP senator to break party lines by convicting the sitting president.

Now, a former spokesman for Romney’s unsuccessful 2012 presidential campaign is speaking out to say that the senator’s vote that Trump was guilty of impeachable offenses “was motivated by bitterness and jealousy.” Rick Gorka, who is currently a communications director for the Republican National Committee (RNC), took to Twitter to say that Romney is just bitter that Trump “accomplished what he [Romney] has failed to do multiple times.”

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He went on to slam Romney for pandering to the very Democrats who ensured he did not win the presidency in 2012.

“These are the same people that hated Mitt in 2012 and they will hate him again when they are done with him,” he added. “It is sad to see that Mitt has not learned the lessons from 2012. Now he has betrayed his Party and millions of voters.”

Gorka wasn’t the only person calling Romney out for his bitterness today, as the president’s son Donald Trump Jr. also got in on the action, going so far as to call for the senator to be “expelled from the GOP.”

“Mitt Romney is forever bitter that he will never be POTUS. He was too weak to beat the Democrats then so he’s joining them now,” he tweeted. “He’s now officially a member of the resistance & should be expelled from the GOP.”

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Romney was well aware that even with his guilty vote, there was no way Trump would be impeached today. He also knew that the majority of his Republican constituents don’t want to see the president be impeached, so the only logical explanation for his vote is that he was indeed bitter.

It’s sad that after so many years, Romney let jealousy cause him to betray the party that has been so devoted to him. Republicans will never be able to look at him the same way again.