"Apparently they're scared of widows and orphans coming into the United States of America," Obama said.
Mocking GOP leaders for thinking they're tough, Obama said overblown rhetoric from Republicans could be a potent recruitment tool for the Islamic State group.
He insisted the US process for screening refugees for possible entry into the US is rigorous and said the US doesn't make good decisions "based on hysteria" or exaggerated risk.
"We are not well served when in response to a terrorist attack we descend into fear and panic," the president said. Obama's comments during a meeting with Philippine President Benigno Aquino marked his harshest condemnation yet of Republicans' response to the Paris attacks blamed on IS that killed 129 people last week.
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Obama took particular ire at a proposal by GOP presidential candidate Jeb Bush to admit only Christian Syrians.
Bush later clarified he wants to give preference to Christians but not exclude properly vetted Muslims. Still, Obama said the idea of only allowing Christians in amounted to "political posturing" that runs contrary to American values.
In Congress, House Speaker Paul Ryan and Senate Majority Leader Mitch McConnell have urged at least a temporary halt in the resettlement of Syrians. Obama pointed out that he's been waiting for a year and a half for Congress to take up a new war powers resolution to address the IS threat, questioning their newfound haste to solve the purported threat of innocents fleeing war.
Although there are indications that one of the IS attackers carried a Syrian passport and may have arrived in France alongside refugees, Germany's top security official has said the passport might have been a fake intended to stoke fears.
Still, Obama acknowledged that the US public was concerned about attacks on the homeland, noting that Paris "reminds us of home. "I understand why Americans have been particularly affected," he said.