Brown's campaign retorted that McMorris was a major Democratic donor who has contributed to Sen. John Kerry and President Barack Obama, among others.
Warren, a bankruptcy expert, argued in the 2009 Supreme Court case that Travelers should be protected from future lawsuits from victims because such suits would prevent similar trusts from being created, making impossible for all victims to be paid. Such trusts shorten the time for victims to receive payments and allow future victims to be compensated, not just the first to sue, Warren maintains.
Brown argued that in this case, asbestos victims were forced to settle for lifetime payments totaling a fraction of what Warren received as a "high-powered" attorney in the case.
Warren did not respond directly to the issue when Brown raised it during the debate, but later told reporters that an important legal principal had been at stake in the case and that she would do the same again. The Democrat has disclosed the payments from Travelers and a legal firm representing the company in previous federal financial disclosure reports.
Warren was scheduled to appear at a rally later Friday in Boston, where she was expected to receive the endorsement of Democratic Boston Mayor Thomas Menino.
Menino, the city's longest serving mayor, had held off until now on making a formal endorsement in the race. Brown said Friday that he considered Menino a friend, and pointed to endorsements he's received from other Democrats, including Menino's predecessor, former Mayor Raymond Flynn.
While Warren expressed her support for Obama at several junctures during the debate, her campaign made a point on Friday to note that Brown never once mentioned Mitt Romney, the former Massachusetts governor and Republican presidential nominee. Polling has suggested Romney trails Obama in his home state by a wide margin.
Brown answered "of course" when asked if he still supported Romney, adding that while he doesn't agree with Romney on everything believes he's the best candidate to address the nation's economic issues.
"She's not running against Mitt Romney, she's running against me," Brown said of Warren.