“spill the beans”
He is probably referring to a breakdown Heide Cruz had a few years back.
I have a feeling the Cruz camp did this to try rope Trump into a response while moving a few more votes in super conservative Utah. He needs to get over 50% of the vote to get all the delegates.
They knew Trump would “go there” about Heid. Know he gets to call Trump a coward while disavowing knowledge of the ad. And he gets to sway the voters of Utah.
Any doubt Ted Cruz would sacrifice his family for politics just went out the window.