Regarding spying on Ted Cruz, does anyone have any idea what the DS could have possibly used for a predicate to spy on him or his campaign?

Cruz announced his campaign on 3/23/15. He dropped out on 5/14/16. He ran a pretty clean campaign.

His National Security advisor was Victoria Coates. She seems a patriot. She was later picked up by POTUS to work on Team Trump.

Campaign Manager, Jeff Roe. Seems okay. Chief Strategist, Jason Johnson, a very aggressive strategist. Been doing same work for other campaigns.I think Matthew Whitaker joined his group this year.

Anyone trying to get a jump on this? Did they plant anyone else in his campaign like they did on Trump’s campaign?