Secret anti-Trump donor revealed
© Greg Nash

A single billionaire provided the lion's share of the money to the main Republican super-PAC set up to destroy Donald TrumpDonald TrumpGeorge W. Bush: 'I don’t like the racism’ Trump budget may cut State dept. anti-Semitism positions: report Trump: It’s ‘better’ I skip WH dinner MORE.

Marlene Ricketts, the matriarch of the Ricketts family that owns the Chicago Cubs baseball team, contributed $3 million to the anti-Trump super-PAC "Our Principles PAC," which is being run by former Mitt Romney adviser Katie Packer. 

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The super-PAC has spent more than $4 million running attack ads against the GOP front-runner in Iowa, New Hampshire, and South Carolina. It is the only serious anti-Trump group to date in a campaign cycle in which Republicans have been reluctant to take on their front-runner.

Until now, the identities of the donors funding Our Principles PAC had been kept secret, fueling the rumor mill in Washington. But the Federal Election Commission reveals that almost all the money came from Ricketts. The donor's identity was first reported by The New York Times.

Ricketts's family had previously given $5 million to a super-PAC supporting the failed presidential bid of Scott Walker. The family is yet to swing its full weight behind another presidential candidate but clearly likes both Ted CruzTed CruzCruz, Lee, Paul demand 'full repeal' of ObamaCare Dem senator: Confirm Gorsuch, Garland simultaneously THE MEMO: Trump takes the fight to Congress MORE and Marco RubioMarco RubioRubio moves to name street outside Russian embassy after slain opposition leader THE MEMO: Trump takes the fight to Congress Rubio says town halls designed for people to 'heckle and scream' MORE. In June last year, Marlene Ricketts gave $10,000 to super-PACs supporting Rubio and Cruz.

Besides a token $250 donation, the only other donor to the anti-Trump super-PAC in January was Illinois businessman Richard Uihlein, who gave just $7,500. 

Uihlein had previously given $2.5 million to Walker's super-PAC, but after the Wisconsin governor quit the race he shifted to the Cruz camp and recently gave $1 million to a pro-Cruz super-PAC.