The president said Congress was requiring him to enforce existing immigration laws while balking at passing a comprehensive bill that would offer illegal immigrants a path to citizenship.
"I am constrained in terms of what I am able to do," Obama said.
"The reason why these deportations are taking place is that Congress said 'you have to enforce these laws'"
"I cannot ignore those laws any more than I can ignore any of the other laws that are on the books."
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"What I have done is to use my prosecutorial discretion," Obama said.
The National Council of La Raza, America's largest Latino advocacy organization, this week broke with the president over the deportation issue.
"Any day now, this administration will reach the two million mark for deportations," said NCLR CEO Janet Murguia.
"It is a staggering number that far outstrips that of any of (Obama's) predecessors, and it leaves behind a wake of devastation for families across America.
Obama said the deportation issue was one of the reasons why it was so important to get comprehensive immigration reform -- already passed by the Senate -- through the House of Representatives.
"I am the champion in chief of comprehensive immigration reform," Obama said.
The president also defended his record on issues important to the Latino community, which voted twice overwhelmingly to send him to the White House.
He said for instance that he had kept many Latino families out of poverty during the recession raging when he came to office in 2009.
The president was appearing at a town hall-style meeting in Washington designed to showcase his health reform law for the Latino community.