Texas GOP Senate candidate Ted CruzRafael (Ted) Edward CruzCruz: 'Of course' it's not appropriate to ask China to investigate Bidens Sunday Show Preview: Trump's allies and administration defend decision on Syria O'Rourke raises .5 million in third quarter MORE cautioned Sunday that Republicans should stay focused on economic issues if they sought to win in November, saying they would lose if they engaged in a “battle of personalities.”

In an appearance on NBC’s Meet the Press, Cruz praised the selection of Rep. Paul RyanPaul Davis RyanAmash: Trump incorrect in claiming Congress didn't subpoena Obama officials Democrats hit Scalia over LGBTQ rights Three-way clash set to dominate Democratic debate MORE (R-Wis.) to the GOP ticket, saying he would ensure the “presidential race focuses on issues.”

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“If it focuses on the economy, on President Obama's abysmal economic record, Republicans win. If it's a battle of personalities, Republicans will lose,” said Cruz. 

“The terrific impact of Paul Ryan is for the next three months we're going to be talking about economic issues, about how to get the 23 million Americans that are out of work back to work, and I think that is great going into this,” he added. 

The former Texas solicitor general and Tea Party favorite scored in upset victory in that state’s Republican primary last month, defeating state Lt. Gov. David Dewhurst.

Cruz is widely favored to win his November Senate race in the GOP-strong state.