After visiting a Border Patrol facility in Brownsville, Texas, holding unaccompanied children, the California Democrat said politics should be set aside to address what President Barack Obama has called an "urgent humanitarian situation." More than 52,000 unaccompanied children, most from Central America, have been apprehended entering the US illegally since October.
"A few days ago I would have been more optimistic about comprehensive immigration reform," Pelosi said.
"I thought that we had been finding a way because we have been very patient and respectful of House Speaker John Boehner, the top Republican in Congress."
She did not elaborate on what had dampened her optimism in this election year. Boehner's office did not immediately respond to a request for comment.
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Immigration reform represents one of the Obama administration's last best chances for a major domestic policy achievement during the final two years of his term, and many Republicans eager to woo Hispanic voters back the idea. But while the Senate passed a sweeping bipartisan immigration bill last year, but legislation never got off the ground in the Republican-controlled House.
House Republican leaders said repeatedly that they wanted to get it done, but opposition from a small but vocal group seemed to derail every attempt.