Weekly Standard editor Bill Kristol made yet another plea Sunday for Mitt Romney or Sen. Ben Sasse to launch a third-party bid to challenge presumptive Republican nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

"Look what's happening to our country. Look at the two party nominees. An independent candidacy is still doable. Please. @MittRomney @BenSasse," Kristole tweeted on Sunday.

Look what's happening to our country. Look at the two party nominees. An independent candidacy is still doable. Please.@MittRomney @BenSasse — Bill Kristol (@BillKristol) July 17, 2016

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Kristol has spearheaded the charge for an independent candidate to enter the race and has worked with conservatives seeking to deny Trump the nomination at the Republican National Convention in Cleveland next week.

Kristol earlier this month encouraged Republican delegates to protest on the floor of the convention.

Trump has ripped Kristol over his efforts, calling him a "loser" and a "dummy."

"Bill Kristol has been wrong for 2yrs-an embarrassed loser, but if the GOP can't control their own, then they are not a party. Be tough, R's!" Trump tweeted in May.

"If dummy Bill Kristol actually does get a spoiler to run as an Independent, say good bye to the Supreme Court!"