Ted Cruz fired away at Donald Trump’s criticism of the primary process on Glenn Beck’s radio program Tuesday, needling the GOP front-runner for his lack of knowledge of the delegate selection process in various states.

Setting aside Trump’s frustration with the Colorado Republican party’s convention last weekend, Cruz retold the Trump campaign’s recent flub of lobbying for support in Washington state, in which an email to supporters listed a filing deadline that had already passed by two days. The mounting number of such missteps led Cruz to needle Trump’s organizational ability.