The United States came under more pressure Sunday to help Europe find sanctuary for a flood of immigrants displaced by war and chaos, but Washington showed no signs of planning a dramatic increase in its intake of refugees.

David Miliband, head of the International Rescue Committee and a former British foreign secretary, called on the United States to bring out "the kind of leadership America has shown on these kind of issues" in the past.

"The United States has always been a leader in refugee resettlement but 1,500 people over four years is such a minuscule contribution to tackling the human side of this problem," Miliband said on ABC's "This Week with George Stephanopoulos."