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 TrumpImpeachment? Not so fast without missing element of criminal intent Feds say marijuana ties could prevent immigrants from getting US citizenship Trump approval drops to 2019 low after Mueller report's release: poll 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 ClintonImpeachment? Not so fast without missing element of criminal intent Former Bush assistant: Mueller report makes Obama look 'just plain bad' Seth Rich's brother calls for those pushing conspiracy to 'take responsibility' MORE.