The exchange began after Trump tweeted to his nearly 5 million followers about UFC fighter Ronda Rousey’s recent loss to Holly Holm in a knockout. Legere then responded:

https://twitter.com/JohnLegere/status/666049308618280961?ref_src=twsrc%5Etfw

And then tweeted again:

https://twitter.com/JohnLegere/status/666054002048679937?ref_src=twsrc%5Etfw

Trump blasted Legere’s business right away:

.@JohnLegere @TMobile John, focus on running your company, I think the service is terrible! Try hiring some good managers.

— Donald J. Trump (@realDonaldTrump) November 16, 2015

And then began to retweet others who disapproved of T-Mobile’s service:

"@StreetR77: @JohnLegere @TMobile didn't know he was CEO of tmobile, I have T-Mobile, it's pathetic, dropped calls, no service."

— Donald J. Trump (@realDonaldTrump) November 16, 2015

Legere then questioned Trump’s choices about what he focuses his tweets on:

https://twitter.com/JohnLegere/status/666071722718818304?ref_src=twsrc%5Etfw

And revealed that, although he does consider himself a member of the GOP, he probably won’t be voting for Trump:

https://twitter.com/JohnLegere/status/666068107698577409?ref_src=twsrc%5Etfw

And for good measure, Legere proclaimed himself the winner at the end of the exchange:

#TIL: The Donald loses… To @RondaRousey in the octagon and to me on Twitter… And probably his quest to be POTUS. #goodnight

— John Legere (@JohnLegere) November 16, 2015

Legere has spoken out via Twitter in the past, taking swipes at Sprint CEO Marcelo Claure’s company policies.