Many of them appear eager to shift attention away from the president’s handling of the pandemic and his $1.9 trillion stimulus bill, which has been well received by the public, and toward an issue that could unite the Republican Party in opposition to Democrats.

Speaker Nancy Pelosi on Sunday called the influx of migrants, particularly children, “a humanitarian challenge to all of us.” But she was determined to cast blame on Mr. Trump and his policies, and longstanding unrest in Central America that had driven waves of migrants north.

“What the administration has inherited is a broken system at the border, and they are working to correct that in the children’s interest,” she said on “This Week” on ABC.

Representative Veronica Escobar, Democrat of Texas, who had also pointed to the Trump administration, said she found the situation at a processing facility that she had toured in El Paso on Friday “unacceptable.”

Nicholas Fandos and Chris Cameron contributed reporting.

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