(CNN) - "Curiously blind" and "wrong."
Is Rick Perry previewing harsh political attacks against Rand Paul should the two potential 2016 presidential candidates square off in a debate over foreign policy?
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The Republican governor of Texas used those and other choice words against the Kentucky Republican senator in a Friday opinion piece that singularly trained political fire on Paul, by name, among Republicans.
Firing back, an adviser for Paul said Perry is "mischaracterizing Senator Paul's foreign policy."
At issue: Paul's ideological preference for the United States to avoid engaging in many hotspots across the world. Critics, such as Perry, liken it to outright isolationism.
"As a veteran, and as a governor who has supported Texas National Guard deployments to Iraq and Afghanistan, I can understand the emotions behind isolationism. Many people are tired of war, and the urge to pull back is a natural, human reaction," Perry began his piece in the Washington Post. "Unfortunately, we live in a world where isolationist policies would only endanger our national security even further."
"That's why it's disheartening to hear fellow Republicans, such as Sen. Rand Paul (Ky.), suggest that our nation should ignore what's happening in Iraq."
A few weeks ago, during an interview with CNN Chief Political Correspondent Candy Crowley, Paul said: "I'm not willing to send my son into that mess."
"Let's not be involved in the Iraq civil war," Paul said, referring to weeks of violence across that country. Radical Sunni militants have battled Prime Minister Nuri al-Maliki's Shiite government forces. The Islamic State in Iraq and Syria, or ISIS, has not only gained ground in northern and western Iraq but also in Syria.
Perry took Paul's sentiments to task.
Noting "the main problem with this argument is that it means ignoring the profound threat that the group now calling itself the Islamic State poses to the United States and the world," the governor wrote. ". …This represents a real threat to our national security — to which Paul seems curiously blind — because any of these passport carriers can simply buy a plane ticket and show up in the United States without even a visa."
Perry then picked apart an opinion piece Paul recently wrote in the Wall Street Journal arguing against U.S. military intervention in Iraq.
Writing that Paul went "so far as to claim…that President Ronald Reagan's own doctrines would lead him to same conclusion," Perry said, "his analysis is wrong. Paul conveniently omitted Reagan's long internationalist record of leading the world with moral and strategic clarity."
And in perhaps one of his harshest critiques, Perry lumped Paul together with a favored political enemy of conservatives: President Barack Obama.
"Viewed together, Obama's policies have certainly led us to this dangerous point in Iraq and Syria, but Paul's brand of isolationism (or whatever term he prefers) would compound the threat of terrorism even further," Perry said.
Paul's team shot back at Perry's harsh criticism with stinging words of its own.
"60,000 children just invaded Texas, and their Governor has time to write an op ed in a Washington newspaper mischaracterizing Senator Paul's foreign policy," adviser Doug Stafford said in a statement to CNN, referring to the flood of unaccompanied children from El Salvador, Honduras and Guatemala surging into the United States along the southern border. "Perhaps he should concentrate on the invasion of his Southern border."
Perry and Paul each are considering a 2016 presidential run. It would be Perry's second run.
CNN's Jason Sehrer and Peter Hamby contributed to this report.