WASHINGTON – The Muslim ban proposed by Republican presidential nominee Donald Trump is "not the America we want", President Barack Obama has said.
Treating Muslim-Americans differently will only make the country less safe by increasing division between the West and the Muslim world, he said.
On Monday Mr Trump extended his ban plan to people from all countries with a terror history against the US.
He said the deadly Orlando nightclub shootings justified such action.
Forty-nine people were killed when Omar Mateen, a US national with Afghan parents, opened fire in a gay club early on Sunday.
Mr Trump said his proposal could be implemented through unilateral executive action, given the president's power to "suspend entry into the country of any class of persons that the president deems detrimental to the interests or security of the United States".
But on Tuesday at the US Treasury in Washington, a visibly angry Mr Obama launched his strongest assault yet on the man who is expected to be confirmed as the Republican nominee next month.