Trump tears into Kristol on Twitter

After Weekly Standard editor Bill Kristol on Sunday evening talked up “an impressive” third-party candidate soon entering the 2016 race, Donald TrumpDonald John TrumpFive takeaways from Trump-Biden debate clash The Memo: Debate or debacle? Democrats rip Trump for not condemning white supremacists, Proud Boys at debate MORE ripped into him on Twitter, calling the prominent conservative voice a “loser” and a “dummy.”

Kristol, one of Trump’s most vocal detractors, has been actively seeking a White House candidate to challenge the de facto GOP nominee from the right, and Sunday he indicated progress:

Trump fired back in a trio of tweets, calling for Republicans “to be smart & strong” and rally behind him in the general election.

Earlier this month, an article from the Breitbart website called Kristol a “Republican spoiler” and “renegade Jew” for his efforts to undermine Trump. Many conservatives believe a third-party bid would split the GOP and hand the race to Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonHillary Clinton after debate: 'Everyone better vote' Hillary Clinton: 'Black Lives Matter' is 'very profoundly a theological statement' House in near-unanimous vote affirms peaceful transfer of power MORE.