My Democratic colleagues have opposed President Donald Trump’s agenda at every turn, and that’s their right. But their decision to shut down the Department of Homeland Security (DHS) isn’t some harmless act of political gamesmanship; it’s incredibly dangerous.In the one month since Democrats voted to deny funding to DHS, the United States has faced at least four apparent terrorist attacks.On March 1, a gunman wearing a "Property of Allah" shirt killed three Americans and wounded 13 others outside Buford’s Backyard Beer Garden in Austin, Texas. On March 7, two men tossed explosives into a crowd of protesters near Gracie Mansion in New York City. The men told the New York Police Department that they had pledged allegiance to the Islamic State. They had hoped to kill more people than the Boston bombers, but the courageous acts of NYPD officers on the scene foiled their attack.DHS HAMMERS DEMS OVER AIRPORT SECURITY LINES AMID FUNDING LAPSEOn March 12, a gunman — who had been released from prison after providing material support to ISIS — entered a classroom on the campus of Old Dominion University, shouted "Allahu Akbar," and opened fire. He killed an ROTC instructor before brave students stopped him. That same day, a man in West Bloomfield, Michigan, injured one security guard when he rammed his vehicle into the Temple Israel synagogue while preschool was in session. According to the Israeli government, the suspect — who apparently shot himself amid a shootout with the Temple’s security — had a brother who was a member of the terrorist group Hezbollah.These terrorists killed four Americans and injured dozens more. It makes me nauseous to imagine how many more could have died if not for the bravery of local law enforcement officers, the Temple’s armed security and Old Dominion’s ROTC students.These attacks on American soil all occurred against the backdrop of President Trump’s decisive action in Iran. To be clear: President Trump had no choice but to strike Iran. He wasn’t trying to start a war; he is trying to end one. Ayatollah Ali Khamenei — who shared the same affinity for killing Americans as the terrorists who just struck within the United States — wanted to resume building nuclear weapons, and he would have been able to do that if we didn’t stop Iran’s missile and drone production soon.I’m confident our airmen will annihilate Iran’s missile supply, but that won’t eliminate the threat to the American people. The Ayatollah may have used his last rotten breath to trigger sleeper cells within the United States. These lone-wolf terrorists may be plotting additional attacks here at home, and we have no clue how many terrorists may be living among us because President Biden left our border wide open for four years.During that time, the Biden administration released at least 99 known individuals from the terrorist watchlist into the country — and those are just the suspects we know about. It will take an all-hands-on-deck effort to find and deport every terrorist lurking among the estimated millions of unvetted people that the Biden administration released into our country.Yet DHS, which employs the very people who should be hunting these lone wolves, is shut down because my Democratic colleagues have been throwing a month-long temper tantrum.At the heart of this meltdown is the fact that many of my Democratic colleagues want open borders. They don’t think we should deport anybody, and they’re holding funding for DHS hostage because they hate the idea that officers at Customs and Border Protection or Immigration and Customs Enforcement (ICE) might actually enforce our immigration laws.CLICK HERE FOR MORE FOX NEWS OPINIONIn turn, they’ve made a series of demands to resume funding. Some of the requests were reasonable, and the Trump administration agreed to implement them as soon as possible. For example, all ICE officers will wear body cameras during future operations. They’d do it right now, but it’s hard to buy cameras when Democrats won’t approve their funding.The remaining Democratic demands are weapons-grade stupid. For example, they want to forbid ICE officers from wearing masks and force them to display their names on their uniforms. These policies would endanger the lives of ICE agents and their families. We can’t expect these law enforcement officers to focus on hunting terrorists when anti-ICE lunatics are following their vehicles or showing up at their churches.We all know some Democrats hate President Trump more than the Devil hates holy water, but we’ve seen four apparent terrorist attacks in two weeks. The Department of Homeland Security isn’t a pawn in a political game. We need these officers focused on spotting sleeper cells, not their missing paychecks. To my Democratic colleagues: Don’t wait for another attack to get serious about protecting America’s security. Reopen DHS today.CLICK HERE TO READ MORE FROM SEN JOHN KENNEDY