Mitt Romney, the GOP’s 2012 presidential nominee, is among those courting prospects for a possible third-party bid to keep presumptive presidential nominee Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE from the White House, according to a Washington Post report.

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Other prospects include Sen. Ben Sasse (R-Neb.), one of Trump’s most vocal Republican critics, and Ohio Gov. John Kasich, who suspended his presidential campaign in early May.

Kasich’s chief strategist, John Weaver, said the governor isn’t interested in running as an independent.

A Sasse spokesman declined to comment.

But it’s not looking too good for a late-in-the-game third-party bid, according to the report.

Deadlines have passed to get on the ballot in big states like Texas, though organizers argue a legal challenge there would be successful.