WASHINGTON - Terrorism and national security are dominating the 2016 race for the White House, at least for the moment. Recent public opinion polls show security concerns now top the economy as the key voter issue for the campaign in the wake of the recent terrorist attacks in Paris and San Bernardino, California.

Security was a major focus of the two most recent presidential debates and has forced several White House contenders to adjust their campaigns to address the shifting political landscape.

Donald Trump remains the dominant figure in the Republican presidential race. The latest Quinnipiac University Poll puts him at 28 percent support among Republican voters with Texas Senator Ted Cruz closing in at 24 percent. Florida Senator Marco Rubio, who has made national security a centerpiece of his campaign, is third with 12 percent, followed by Dr. Ben Carson with 10 percent.

The survey also found, however, that 50 percent of those surveyed — including both Republicans and Democrats — would be embarrassed to have Trump as president.

FILE - U.S. Republican presidential candidate Dona
U.S. Republican presidential candidate Donald Trump addresses the crowd during a campaign rally in Grand Rapids, Michigan, Dec. 21, 2015.

Republicans rate Trump best on terrorism

One of the keys to Trump’s enduring success with Republican voters is that they view him as the best contender to deal with the threat of terrorism.

A recent Quinnipiac survey of Republican voters in Iowa found 33 percent picked Trump as the candidate best able to handle terrorism, ahead of Cruz and Rubio.

Trump is fond of quoting poll results at his campaign rallies. “This isn’t going to be an election on niceness any more, even if I wasn’t nice,” Trump told supporters recently in Cedar Rapids, Iowa. “This is going to be an election on competence and smartness and toughness, because otherwise our country is finished. It’s finished.”

During the recent Republican debate in Las Vegas, rival Jeb Bush described Trump as the “chaos candidate” and questioned whether Trump was ready to lead.

“If I’m president, I’ll be a commander in chief, not an agitator in chief or a divider in chief, and that I will lead this country in a way that will create greater security and greater safety,” Bush said as Trump scoffed in a split-screen reaction shot on the CNN broadcast.

Many experts thought the focus on security would help establishment contenders like Bush.

“People who are seen as grownups, adults, mature, seasoned and ready for this,” said independent analyst Stuart Rothenberg. But it hasn’t worked out that way. "So far the early indications are that it has helped the kind of loudest, blustery candidate, and that would be Donald Trump,” he said.

South Carolina Senator Lindsey Graham was perhaps the foremost national security candidate in the Republican field. Graham set himself apart by announcing that if elected he would send thousands of U.S. troops back into Iraq and into Syria to combat Islamic State fighters. Graham ended his presidential campaign this week, though, never able to move beyond about one-percent support in the polls.

Bernie Sanders, left, listens as Hillary Clinton s
Bernie Sanders, left, listens as Hillary Clinton speaks during a Democratic presidential primary debate at Saint Anselm College in Manchester, N.H., Dec. 19, 2015.

Clinton also benefits

This new emphasis on security also appears to have helped Democratic frontrunner Hillary Clinton widen her lead over rival Bernie Sanders. He has drawn support from progressive Democrats for his crusade over income inequality. His poll numbers have dropped in recent weeks, however, as Democratic voters took note of the recent terror attacks and focus on national security.

Clinton wants to intensify the military campaign against Islamic State fighters by stepping up the air campaign and by forming an international coalition to confront the jihadists on the ground.

But Clinton also seems to be looking ahead to the general election campaign by going after some of the Republican contenders on national security, including Cruz who vowed to “carpet bomb” the Middle East to defeat the Islamic State group.

“Promising to carpet-bomb until the desert glows doesn’t make you sound strong. It makes you sound like you are in over your head,” Clinton said in a recent national security speech in Minneapolis.

Iraqi soldiers train with members of the U.S. Army
Iraqi soldiers train with members of the U.S. Army 3rd Brigade Combat Team, 82nd Airborne Division, at Camp Taji, Iraq, in this U.S. Army photo released June 2, 2015.

Sanders warns about US role

During the recent Democratic debate in New Hampshire, Sanders acknowledged the threat posed by Islamic State, but warned against repeating past mistakes.

"The United States must lead, but the United States is not the policeman of the world, and the United States must not be involved in perpetual war in the Middle East,” Sanders said, part of a growing side-debate on whether the United States should force the ouster of Syrian President Bashar al-Assad.

The focus on terrorism and security should help Clinton in the Democratic primaries.

Analyst John Fortier of the Bipartisan Policy Center in Washington warned that the laser-like focus of Republican contenders on what they see as the foreign policy failures of President Barack Obama could be a liability in the general election.  

“The president’s [poll] numbers have really gone down on foreign policy. He is seen, especially on terrorism, but broadly on foreign policy, as being weaker," said Fortier.

Obama has taken note of the Republican barrage and has sought to reassure voters his administration remains committed to taking the fight to ISIL, a term he uses to describe the Islamic State group.

“We are hitting ISIL harder than ever in Syria and Iraq. We are taking out their leaders and our partners on the ground are fighting to push ISIL back, and ISIL has been losing territory,” the president said last week after a visit to the National Counterterrorism Center in Virginia outside Washington.

What’s clear from the last few weeks is that world events can have a huge impact on the direction of the U.S. presidential race, adding yet another level of unpredictability to what already has been a most unexpected campaign cycle.