Debris from Tuesday's ISIS-inspired attack in Belgium hadn't been sifted before U.S. lawmakers began politicize it.

Republican presidential front-runner Donald Trump used bombings of Brussels' airport and a downtown subway station to clarify his pro-torture belief. Not only would Trump exclude Syrian refugees from immigrating to the United States, he would approve waterboarding as an acceptable interrogation technique.

"I would use waterboarding," Trump said on ABC's "Good Morning America." "And I wouldn't try to expand the laws to go beyond waterboarding."

Texas Sen. Ted Cruz, who trails Trump by 274 delegates for the Party's nomination, proposed additional surveillance of all Muslims. "We need to empower law enforcement to patrol and secure Muslim neighborhoods before they become radicalized," Cruz said in a statement posted to Facebook.

Cruz said ISIS cannot be defeated as long as a sitting U.S. president - a shot at President Obama - refuses to label their beliefs "radical Islam."

"That ends on January 20, 2017, when I am sworn in as president. We will name our enemy - radical Islamic terrorism. And we will defeat it."

Obama, for his part, took in the Tampa Bay Rays- Cuba national team game alongside Cuban President Raul Castro. His demure response drew criticism from conservatives, including Ohio Gov. John Kasich who chided the president for staying through a majority of the baseball game.

"If I were in Cuba right now, the last thing I would be doing is going to a baseball game," Kasich said during a fundraiser in Minnesota.

Terrorists Crossing the Border

The presidential campaign cycle has blurred lines between immigration and national security. Whereas undocumented immigration was primarily an economic issue, Trump - among other candidates - implies there is inherit danger in allowing any undocumented immigration.

Trump and Cruz each vow to restructure the wall along the U.S.-Mexico border. Cruz says he will deport the 11 million undocumented immigrants in the country; Trump toggles between the idea.

In 2014, former Texas Gov. Rick Perry asserted that ISIS supporters could circumvent U.S. counterterrorism units by going through Mexico.

"We have no clear evidence of that, but your common sense tells you, when we see the number of criminal activities that have occurred - the assaults, the rapes, the murders - by individuals who have come into this country illegally over the last five years," Perry said.

Nearly one year later, Trump announced his presidential candidacy by calling Mexicans "rapists" and "criminals," albeit with the disclaimer that some are "good people."

Brussels and U.S. Immigration

Belgium has its own conservative political party aimed at curving illegal immigration. The right-wing Vlaams Belang called for a "waterproof border policy" following the March 23 attacks, and Marine Le Pen, leader of France's National Front, called for sweeping raids of minority neighborhoods; similar to Cruz's proposal but more discriminate.

Republican candidates wouldn't go as far, if only because they're trying to win over Latinos and African-Americans. Their efforts likely won't gather much information, anyway. Brussels' Molenbeek district, where at least one of Tuesday's explosions occurred, houses a large population of North African and Middle Eastern immigrants. It is, essentially, where ISIS fighters head once they reach Europe.

These are large numbers of unverified Muslims; it's a melting pot for the good, the bad, and the villainous.

The U.S. Muslim population isn't as prevalent, though violent actions of the few who are radicalized have detrimental consequence on other minorities.

"All the bad things that are happening are from one-tenth of a percent of people doing the harm. We can do 99 percent of things well, there's going to be one percent that won't," said Mi Familia Vota Executive Director Ben Monterroso, in speaking with Latin Post.

"Governing and leading by fear and anger is not the same as leading by hope and unity."