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“If Trump loses any combination of the states that vote on Tuesday, March 15, his path becomes improbable — and should he lose Florida, Ohio and Illinois, it will be nearly impossible for Trump to emerge as the Republican nominee for President,” reads a memo from Our Principles PAC, a group working to stop Donald Trump from becoming the Republican nominee. | AP Photo Super PAC memo outlines delegate math for stopping Trump

Donald Trump is unlikely to amass the 1,237 delegates needed to secure the Republican nomination, the leading anti-Trump super PAC argued in a memo Wednesday.

Our Principles PAC, a super PAC run by former Mitt Romney aide Katie Packer that has spent millions of dollars' worth of TV ads savaging Trump, said the Republican front-runner severely underperformed last weekend when he won Kentucky and Louisiana but lost Kansas and Maine to Ted Cruz.

“If Trump loses any combination of the states that vote on Tuesday, March 15, his path becomes improbable — and should he lose Florida, Ohio and Illinois, it will be nearly impossible for Trump to emerge as the Republican nominee for President,” the memo reads.

The missive lays out various scenarios that could play out on Tuesday and beyond. Trump could win a series of states, Our Principles allows, but still fall short of the 1,237-delegate mark if he loses Florida and Ohio.

Even if Trump wins Florida — where he has a big lead in the polls — and a number of upcoming states, he would still be below the delegate threshold, according to the memo.

Should Trump manage to win Florida and Ohio, as well as a number of additional states the memo outlines, he would again be short of the necessary delegates.

“Further complicating Trump’s chances is the fact that there are a number of closed primaries coming up, where only Republicans are allowed to vote — such as Florida’s primary,” the memo says. “To date there have only been three such contests: Oklahoma and Idaho (both of which Trump lost); and Louisiana (which he carried by a narrow 41% - 38% margin). After March 15, there will be twelve more ‘closed’ primaries … representing 636 delegates or 44% of the delegates yet to be chosen.”

“Given the current dynamics of the race,” the memo concludes, “it will be difficult for Donald Trump to win the 1,237 delegates needed to secure the nomination.”

The Washington Post first reported the memo.