WASHINGTON - A Republican congressional leader on Monday defended a House investigation of Planned Parenthood's provision of fetal tissue to researchers, offering no suggestion that last week's shooting deaths at one of the group's clinics will cause the GOP to retreat from that probe.

House Majority Leader Kevin McCarthy (R., Calif.) also indicated that the Republican-run Congress will not risk a government shutdown fight with President Obama over GOP efforts to halt federal funding for the organization, which provides abortions and other health services to women.

"I do not see a shutdown happening in this process," he told reporters.

With lawmakers returning to the Capitol for the first time since Friday's killing of three people at a Planned Parenthood clinic in Colorado Springs, Colo., the Senate's top Democrat called on House Republicans to abandon their investigation of the group, which he called politically motivated. Without naming Republicans, Senate Minority Leader Harry Reid (D., Nev.), seemed to insinuate that the GOP has helped create a dangerous brew of issues.

"Whipping people into a frenzy of hate and anger while providing them with easy access to firearms has proven disastrous to our country," Reid said. "We have a responsibility as leaders to think very hard about what we say and do in this context."

McCarthy stood by the Republican-created House panel investigating how fetal parts are made available for research by Planned Parenthood and other organizations.

McCarthy said that committee, which includes Democratic members, is "where all pieces of information can come forward. We'll see how that plays out."

Democrats have said they are participating in that panel to be able to defend Planned Parenthood.

McCarthy contested suggestions by Planned Parenthood defenders that harsh language by the group's critics helped create a hostile political environment that could encourage people to react violently against the organization. Interviewed Monday on NPR, Planned Parenthood President Cecile Richards said "hateful rhetoric" against groups providing health care for women "has real impact."

McCarthy suggested he's seen heated rhetoric from abortion-rights defenders as well and said, "This individual, this shooting, the thing that drove him most is he's an evil, crazy man."

Robert Lewis Dear, who acquaintances have called a loner, is accused of killing three people in the Colorado attack. A law enforcement official said Dear told authorities "no more baby parts" after being arrested, an apparent reference to secretly recorded videos of Planned Parenthood officials discussing tissue donations that have fueled an uproar among congressional Republicans and abortion opponents nationally.

Some conservatives want congressional leaders to include language blocking Planned Parenthood's federal funds in a bill keeping federal agencies functioning past Dec. 11. Obama would veto such a bill, resulting in a partial government shutdown.

While saying he personally supports halting Planned Parenthood's federal funding, McCarthy said of his GOP colleagues, "I do not hear people shutting the government down over it."