The Club for Growth Action announced Monday it is spending about $2 million on ads in Illinois against GOP presidential front-runner Donald TrumpDonald TrumpJulian Castro knocks Biden administration over refugee policy Overnight Energy & Environment — League of Conservation Voters — Climate summit chief says US needs to 'show progress' on environment Five takeaways from Arizona's audit results MORE.
David McIntosh, the group's president, argued that "momentum is shifting away" from Trump following his losses to Sen. Ted CruzRafael (Ted) Edward CruzFBI investigating alleged assault on Fort Bliss soldier at Afghan refugee camp The Memo: Biden's immigration problems reach crescendo in Del Rio Matthew McConaughey on potential political run: 'I'm measuring it' MORE (R-Texas) over the weekend in Kansas and Maine. Cruz and Trump also tied for delegates in Louisiana's primary.
"Republican voters don’t want a big-government liberal like Donald Trump at the top of the GOP ticket," McIntosh said.
"They know that Trump would cost Republicans the White House, the Senate majority, and, ultimately, the Supreme Court. It will be no surprise to see the numbers tighten in tomorrow’s primaries and caucus."
McIntosh then called the front-runner out for his "far-left positions on taxes, health care, bailouts and the abuse of eminent domain" before making a reference to Trump's satement in Thursday's debate that he was changing his position on green cards for high-skilled workers.
"And now he sounds like the worst kind of politician, warning voters that he will change positions when he feels like it," McIntosh said.
"The shell game that is the Trump candidacy needs to be stopped.”