NEW YORK — Wall Street is getting ready to go nuclear on Donald Trump.

Terrified that the reality TV star could run away with the Republican nomination and bring his brand of anti-immigrant, protectionist populism to the White House, some top financiers are writing big checks to fund an effort to deny Trump a majority of delegates to the GOP convention.

The effort is centered on the recently formed Our Principles PAC, the latest big-money group airing anti-Trump ads, which is run by GOP strategist Katie Packer, deputy campaign manager for Mitt Romney in 2012.

The group, initially funded by $3 million from Marlene Ricketts, wife of billionaire T.D. Ameritrade founder Joe Ricketts, wants to saturate the expensive Florida airwaves ahead of the state's March 15 primary with hopes of denying Trump a victory that could crush the hopes of home state Sen. Marco Rubio.

A conference call on Tuesday to solicit donors for the group included Paul Singer, billionaire founder of hedge fund Elliott Management; Hewlett Packard President and CEO Meg Whitman; and Chicago Cubs co-owner Todd Ricketts, one of Joe and Marlene Ricketts' three sons. Wealthy Illinois businessman Richard Uihlein is also expected to help fund the effort. Jim Francis, a big GOP donor and bundler from Texas, was also on the phone call on Tuesday.

One person close to the Our Principles PAC said money will not be an issue.

This person said Singer, who is worth close to $2 billion, is fully dedicated to making sure the group has all the funds it needs to inundate the airwaves in Florida and other states viewed as not entirely friendly to Trump, a group that includes Illinois, Missouri, Arizona, Wisconsin and other states in the Northeast and West. Ohio could join the list if Trump moves ahead of the state's governor, John Kasich, in the polls.

"The money is not going to be a problem. We will raise what we need to do what we need to do," the person close to the new anti-Trump PAC said. "Yes, there are people who are skeptical, but there are just as many ready to write big checks. The question is only whether Trump truly is really Teflon."

The theory, this person said, is that voters are still largely unaware of the full case against Trump. "We have not seen how he holds up to real sustained attacks over the KKK and David Duke stuff, over Trump University, over Trump Mortgage. People don't really know about that stuff. We are about to find out what happens when they find out about it."

Hope Hicks, a spokeswoman for Trump, dismissed the latest effort. "This is yet another attempt by the establishment elites and dark money that control the weak politicians to maintain control of our broken and corrupt system. Mr. Trump will continue to stand for the people and the issues they care about," she said.