Homeland Security Secretary Alejandro Mayorkas from Joe Biden’s team pushed back on Sunday with the words, “The border is closed.” The statement comes amidst fast mounting criticism that the Biden team has carried out the immigration policy incompetently.  

It has spurred a huge number of migrants in the biggest crisis to emerge under the new president. Homeland Security Secretary said that the administration’s message for border-crossers was simple, “Now is not the time to come. Do not come. The journey is dangerous.”

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“We are building safe, orderly and humane ways to address the needs of vulnerable children,” he said on ABC’s “This Week.”

But with an estimated 15,000 migrant children or teenagers already in federal custody — roughly a third of them in facilities meant for adults — and with the United States on pace to see two million undocumented migrants arrive this year, the problem has become impossible to ignore.

Biden himself vowed Sunday to visit the border and said he was stepping up the message to migrants to stay home.

“We’re in the process of doing it now, including making sure that we reestablish what existed before, which was — they can stay in place and make their case from their home country,” he told reporters.

Many Republicans, but also a growing number of Democrats, have criticized the administration’s border policies.

Mayorkas, appearing on three television networks, insisted that the administration was doing everything it could to address the influx, but said the task was complicated by policies inherited from Donald Trump’s administration and by the Covid-19 pandemic.

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“We have a plan. We are executing on our plan and we will succeed,” the Havana-born Mayorkas said on ABC. “But one thing is also clear, that it takes time.”

Mayorkas repeatedly placed blame on Biden’s predecessor Trump, who imposed an array of anti-immigration policies.

“The entire system… was dismantled in its entirety by the prior administration” and had to be rebuilt, Mayorkas said.

He said three new facilities had been opened to handle border arrivals just last week.

But Republicans flatly rejected that analysis, with Michael McCaul, a Texas lawmaker, calling Mayorkas’s comments “very irresponsible.”

“They’ve created the crisis. He says he has a plan. I haven’t seen a plan,” he said, also on ABC.

Trump issued a statement claiming his border policies had been a success, and attacking Biden.

“All they had to do was keep this smooth-running system on autopilot,” Trump said. “Instead, in the span of a just few weeks, the Biden Administration has turned a national triumph into a national disaster.”

A bipartisan group of US lawmakers visited immigration facilities in the El Paso, Texas area last week, and several emerged with sharp criticism.

Senator Chris Murphy, a Democrat, said he saw hundreds of children packed into a “big, open room,” and “fought back tears” as he listened to a 13-year-old girl who was distraught after being separated from her grandmother.

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Mayorkas, who traveled with the group to El Paso, said that under the previous administration, such a girl would have been “turned away and turned into the desert of Mexico or sent back to the very country from which she fled, by reason of fear or prosecution.”

Biden said early on that he wanted to roll back some of the harsher policies imposed by Trump, but that first he needed to impose “guardrails” to prevent a huge influx of migrants.

But in a departure from the previous administration, he began allowing unaccompanied children into the country.

More than 10,000 unaccompanied children are now in the care of the Department of Health and Human Services. The Customs and Border Protection agency is caring for 5,000 others.

The influx had begun to grow even before Biden came to office in January, propelled partly by deteriorating conditions in parts of Central America.

And in January, Mexico stopped taking back some families being expelled by the United States.