Texas GOP Senate candidate Ted CruzTed CruzHow 'Big Pharma' stifles pharmaceutical innovation AIPAC must reach out to President Trump Under pressure, Dems hold back Gorsuch support 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 RyanGOP chairman: 'This bill is dead' House cancels ObamaCare repeal vote as GOP defections mount White House: Vote at 3:30; Trump left 'everything on field' 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.