Ted Cruz’s long-anticipated Iowa surge came a step closer on Tuesday with a new poll showing him just behind Donald J. Trump and leaping ahead of Ben Carson, as terrorism and foreign policy now drive the 2016 nominating race.

Mr. Cruz, the Republican Texas senator, was the choice of 23 percent of likely Republican caucusgoers in the new poll, from Quinnipiac University, following Mr. Trump at 25 percent and ahead of Mr. Carson at 18 percent. Senator Marco Rubio of Florida was in fourth with 13 percent. The margin of error was plus or minus four percentage points.

Read the article “Ted Cruz Makes a Big Leap in Iowa, Poll Says” on nytimes.com.