Major Mitt Romney 2012 Donors Shun Donald Trump in Favor of Down-Ballot Races

Several of Mitt Romney's top donors have not given to Trump's campaign.

— -- Several top Republican donors have made hefty contributions this election cycle — just not to the top of the GOP ticket.

Singer, who earlier this summer said Trump’s economic policies could cause a “global depression,” also gave $2.5 million to Our Principles PAC, intended to stop Trump from winning the GOP nomination.

Singer is still supporting Rubio, who is now running for re-election to the Senate, and has given him $5,400, the maximum allowed.

The most glaring absence from Trump’s donor list is that of Sheldon Adelson, the Las Vegas casino mogul who threw his support behind Trump in May and offered to contribute to his campaign. According to FEC records, Adelson donated $15 million to Romney’s super PAC during the 2012 election, and a study by ProPublica found that Adelson and his wife donated $98 million overall.

A representative for Adelson declined to comment to ABC News for this article.

Others who gave at least $50,000 to Romney’s super PAC in 2012 but have eschewed Trump this year in favor of down-ballot races include billionaires Robert Rowling, Frank VanderSloot and Todd Ricketts.

Even several donors named to the Trump Victory Leadership Committee, which coordinates with the Republican National Committee to fundraise for Trump, are donating to congressional races over the presidential one.

As of the end of June, only seven of the 22 Trump Victory Leadership Committee members donated to the Trump Victory Fund, the joint effort between the Republican Party and the Trump campaign. The fund is required to disclose its finances quarterly, and it is possible more members donated in July and August. Even so, within a month of being named to the leadership team, not even one-third of them donated to the fund directly, though several have given ample amounts to the RNC.

Nearly all the members who haven’t donated to Trump, however, have donated to down-ballot races.