Fredreka Schouten

USA TODAY

They tried, and they failed.

Our Principles PAC, which mounted a last-ditch effort to derail Donald Trump's presidential campaign, spent nearly $19 million through the end of April, according to a campaign report filed Friday afternoon.

Connecticut-based investor Michael Vlock and New York hedge-fund billionaire Paul Singer each donated $1 million to the super PAC last month, bringing their total investment in the group to $5.2 million. Early benefactors included members of the Ricketts family, who own the Chicago Cubs.

The group took in $2.7 million last month and spent $3.3 million as it sought to persuade primary voters and delegates to the Republican National Convention to dump Trump.