GOP senator lashes out at Trump after meeting

Republican Sen. Mark KirkMark Steven KirkDuckworth announces reelection bid Brave new world: Why we need a Senate Human Rights Commission  Senate majority battle snags Biden Cabinet hopefuls MORE (Ill.) is striking out at Donald TrumpDonald TrumpDC goes to the dogs — Major and Champ, that is Biden on refugee cap: 'We couldn't do two things at once' Taylor Greene defends 'America First' effort, pushes back on critics MORE after the presumptive GOP presidential nominee reportedly insulted him at a closed-door caucus meeting.  

"I don't believe you have the temperament or judgment to be our commander-in-chief," he said in a tweet directed at Trump on Thursday. 
Kirk also fired off the same tweet in Spanish.
In his meeting with Senate Republicans Thursday, Trump reportedly predicted that he could carry Illinois in November and called Kirk a loser, according to The Washington Post.
Kirk, like a handful of other vulnerable GOP senators, was not at the meeting, but he has still lashed out at Trump over his comments. 
Asked about Trump's remarks Thursday, he fired back, telling reporters: "He's wrong. I've never been defeated."
“We haven’t seen a personality like his too much in the Midwest,” Kirk added separately, according to The Associated Press. "[He’s an] Eastern, privileged, wealthy bully. Our bullies are made of better stuff in Illinois. We’re much more practical and polite.”
Kirk, widely considered one of the most vulnerable GOP incumbents, has repeatedly broken with his party on supporting the presumptive nominee heading into November. He also created waves earlier this year when he became the only senator to withdraw an endorsement of Trump. 
"I have concluded that Donald Trump has not demonstrated the temperament necessary to assume the greatest office in the world," he said in a statement in June. 
Kirk faces an tough battle for reelection against Democratic Rep. Tammy Duckworth in a state widely expected to be a victory for Hillary Clinton, the presumptive Democratic presidential nominee, in November.
Republicans are defending 24 Senate seats. Democrat need to net five — or flip four and retain the White House — to win the majority.