Sen. Ben Cardin Benjamin (Ben) Louis CardinPelosi hopeful COVID-19 relief talks resume 'soon' Congress must finish work on popular conservation bill before time runs out PPP application window closes after coronavirus talks deadlock MORE (D-Md.) on Monday blamed the Trump administration for causing "anxiety" at the southern border a day after border agents fired tear gas in response to migrants attempting to breach the border.

"There’s a better way to handle this. The United States, the Trump policies has caused anxiety at the border," Cardin said on CNN's "New Day."

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"There's an orderly process that should have been used," he added. "Should we fix our immigration system? Absolutely. But this administration has made no effort to fix our immigration system."

"We are looking at children being subject to tear gas and that's the United States causing that, and that's outrageous," says Sen. @BenCardinforMD on authorities on the US side of the US-Mexico border using tear gas to disperse migrants on Sunday https://t.co/w67XCL3JqD pic.twitter.com/gv8UwbwOTf — New Day (@NewDay) November 26, 2018

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE has repeatedly blamed Congress and Democrats, in particular, for failing to pass legislation hardening the country's immigration laws. The White House and lawmakers have been unable to reach an agreement on a host of immigration issues, though Congress has provided some funding for border security.

Cardin said Monday that the Trump administration has enacted policies that have exacerbated the problem at the border with the so-called caravan of Central American migrants, citing the White House's move to curb immigrants' ability to claim asylum and the previous policy of separating families who illegally cross the border.

"So they’re making the circumstances worse, and here we look at children being subject to tear-gassing," Cardin said. "That’s the United States causing that. That’s outrageous."

Customs and Border Protection (CBP) on Sunday shut down the busy San Ysidro port of entry near San Diego as hundreds of migrants approached. Tensions flared further when dozens of migrants broke away from a larger group to try and breach the border.

CBP said in a statement that officers fired tear gas into the crowd after attempted illegal crossings and after some migrants threw rocks at border agents.

Trump on Monday morning called on Mexico to deport the migrants back to their home countries and threatened to permanently close the southern border. The president has for weeks painted the group of migrants as an imminent security threat, prompting fierce criticism from Democratic lawmakers.