Texas GOP Senate candidate Ted CruzRafael (Ted) Edward CruzOvernight Finance: GOP criticism of tax bill grows, but few no votes | Highlights from day two of markup | House votes to overturn joint-employer rule | Senate panel approves North Korean banking sanctions GOP criticism of tax bill grows, but few ready to vote against it Anti-gay marriage county clerk Kim Davis to seek reelection in Kentucky 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 rep: Virginia defeat 'a referendum' on Trump administration After Texas shooting, lawmakers question whether military has systemic reporting problem Pence: Praying 'takes nothing away' from trying to figure out causes behind mass shooting 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.