The campaign headlines alone — featuring tense protests and fistfights, and a front-runner warning of riots — are cause enough for concern. Add two major terrorist attacks abroad in four months into the cauldron, including Tuesday's bombings in Brussels, and it's not hard to imagine the potential for chaos at the Republican National Convention this summer.

Still, convention organizers and security officials say they're ready to execute a plan that was in the works before fisticuffs broke out regularly at Donald Trump's rallies.

Numerous officials involved with convention planning told Politico they've been preparing meticulously for months, mapping out every contingency. An array of law enforcement agencies, from the Secret Service to the Department of Homeland Security, are involved, in concert with the city of Cleveland's own efforts to keep the event safe.

The security blueprint already took into account worst-case scenarios, from mass riots to terrorist attacks, among other possible crises. The convention is expected to draw some 50,000 attendees, along with potentially tens of thousands of protesters.

"The Secret Service carries out its responsibilities by relying on a core strategy of forming partnerships with all participating law enforcement, public safety officials and military agencies," said Kevin Dye, a Secret Service spokesman. "This NSSE [National Special Security Event] will be no different, as there are numerous partners involved in the planning and implementation of the overall security plan."

Still, Juliette Kayyem, former assistant secretary for intergovernmental affairs at the DHS, said that "without a doubt" the global environment and Republican Party friction over Trump increase the risk factor at the convention.

"People who might be activated by what's going on in the world would view the convention as a desirable target because everyone is there and everyone is watching," Kayyem said. "Both Trump critics and supporters are going into near hand-to-hand combat, [so] this will also be a very high-tension convention if there are any political 'shenanigans,' as Donald Trump says."

The DHS is tasked with designating National Special Security Events — essentially gatherings of national or international significance that could be a potential target for terrorism or other criminal acts. Pope Francis' recent visit to the United States fell into that category.