The alliance cracked open after they backed different contenders in the Ohio senate primary two weeks ago. And it has fractured further as the Club for Growth has doubled down by pumping millions into Tuesday’s Pennsylvania primary to boost late-surging Kathy Barnette against Trump’s candidate, the physician and television personality Mehmet Oz — putting two of the most influential forces in the GOP, Trump and the Club for Growth, at odds.

In an interview Monday, Trump said, “It’s their right to do it, but it’s a rather hostile act. It doesn’t mean I have to like it.”…

“They’re spending millions and millions of dollars, and I’m saying that could certainly break up a romance. That could break up a good romance,” Trump said of the group’s involvement in the Pennsylvania and Ohio Senate races.

Trump said he wasn’t sure why McIntosh was working hard against his candidates.

“I don’t know. Maybe they’re trying to prove a point. So far it hasn’t worked,” he said.

He added: “It’s almost like they wanted to show me something.”