WASHINGTON (CBSNewYork/AP) -- Tempers flared at a Senate hearing on immigration legislation Monday as a Republican senator objected to a Democrat's criticism of attempts by some to link the Boston Marathon bombings to the immigration bill.
"I never said that! I never said that!'' Sen. Chuck Grassley, R-Iowa, interjected as Sen. Chuck Schumer, D-N.Y., suggested that some were using the Boston bombings as "an excuse'' to slow down or stop the bill.
Schumer said he wasn't talking about Grassley, who said last week that the bombings raised question about gaps in the U.S. immigration system that should be examined in context of the new bill.
Meanwhile Sen. Jeff Sessions, R-Ala., accused Schumer of "demeaning'' several witnesses called to Monday's Judiciary Committee hearing by the GOP side.
Schumer had complained about Sessions saying that business and labor officials backing the Democratic side on immigration were "special interests,'' noting that the immigration bill has widespread support and asserting that the three witnesses scheduled to testify against the bill were "far more special interest.''
Senate Judiciary Chairman Patrick Leahy, D-Vt., banged his gavel to settle the proceedings.
The exchange came as the Judiciary Committee opened its second hearing on sweeping legislation to strengthen border security, allow tens of thousands of new high- and low-skilled workers into the country and provide an eventual path to citizenship for some 11 million immigrants now here illegally.
As happened at the first hearing Friday, the Boston Marathon bombings cast a shadow over the proceedings.
The bombing suspects, brothers Dzhokhar Tsarnaev and Tamerlan Tsarnaev, were Chechen immigrants.
Dzhokhar Tsarnaev came to the United States in 2002 with his father and applied for political asylum. He gained lawful resident status in February 2007 and became a U.S. citizen on Sept. 11, 2012.
Tamerlan Tsarnaev, who was killed in a shootout with police last week, had applied for citizenship status but his application was delayed.
Leahy used part of his opening statement to chastise those who would link the bombings to the legislation.
"Last week opponents of comprehensive immigration reform began to exploit the Boston Marathon," he said. "Let no one be so cruel as to try to use the heinous acts of these two young men last week to derail the dreams and futures of millions of hardworking people."
He said the bill would strengthen national security by focusing on border security and enforcement.
Grassley bridled at Leahy's comments, saying that when Leahy proposed gun legislation, "I didn't accuse you of using the Newtown killings as an excuse.''
"I think we're taking advantage of an opportunity where once in 25 years we deal with immigration to make sure that every base is covered,'' Grassley said.
Sen. Rand Paul, R-Ky., raised similar concerns in a letter Monday to Senate Majority Leader Harry Reid, D-Nev., telling him, "We should not proceed until we understand the specific failures of our immigration system.''
Paul also said that national security protections must be part of any immigration legislation to ensure the federal government does everything it can to keep immigrants "with malicious intent'' from using the immigration system to enter the country to commit acts of terror.
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