United States presidential candidates reacted to the deadly terror attacks that shook the city of Brussels Tuesday, where dozens lost their lives and hundreds more were injured in coordinated attacks at Zaventem airport and the Maelbeek subway station.

GOP front-runner Donald Trump, speaking on Fox News’ “Fox and Friends,” warned that “lax” security in the U.S. and abroad will lead to more terror attacks.

“In my opinion, this is just the beginning. It’s going to get worse and worse because we are lax and we are foolish,” Trump said. “I would close up our borders to people until we figure out what’s going on. We have to be very, very vigilant with who we let into this country.”

In a Facebook post, Texas GOP Sen. Tex Cruz said his heart goes out to people of Belgium, but warned that the attacks were not isolated and were merely the “latest in a string of coordinated attacks by radical Islamic terrorists.”

Our hearts break for the men and women of Brussels this morning. Make no mistake — these terror attacks are no isolated…

Posted by Ted Cruz on Tuesday, March 22, 2016

“Make no mistake — these terror attacks are no isolated incidents. They are just the latest in a string of coordinated attacks by radical Islamic terrorists perpetrated by those who are waging war against all who do not accept their extreme strain of Islam,” Cruz wrote. “Radical Islam is at war with us.”

Ohio Republican Gov. John Kasich, in a statement released by the campaign, expressed his condolences for the people of Belgium and said that he was “sickened” by the “carnage” and loss of life.

“The wave of terror that has been unleashed in Europe and elsewhere around the world are attacks against our very way of life and against the democratic values upon which our political systems have been built,” he said. “We and our allies must rededicate ourselves to these values of freedom and human rights. We must utterly reject the use of deadly acts of terror.”

Democratic front-runner Hillary Clinton, speaking on NBC’s “Today”, labeled the attacks “deeply distressing” and urged Americans and law enforcement authorities to be vigilant in the coming days and weeks.

“We’ve gotta tighten our security,” she said, adding that “we’ve got to be absolutely strong and smart and steady in how we respond.”

However, Clinton, seemingly rebuking Trump’s earlier comments, said that it’s “completely unrealistic” to shut down U.S. borders, saying it would, “for example,” shut down commerce.

Clinton’s challenger, Vermont Sen. Bernie Sanders, was the final candidate to release a statement on Tuesday’s terror attacks. In his statement, Sanders said Tuesday’s attack is a “brutal reminder that the international community must come together to destroy ISIS.”

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