WASHINGTON (AP) - Obama administration officials are defending their response to the immigration crisis on the southwest border and promising to stem the tide of unaccompanied children arriving from Central America.

WASHINGTON (AP) Obama administration officials are defending their response to the immigration crisis on the southwest border and promising to stem the tide of unaccompanied children arriving from Central America.

In testimony prepared for a Senate hearing Wednesday, several officials, including the heads of the Federal Emergency Management Agency and of Customs and Border Protection, argue the administration is acting aggressively on multiple fronts. They say they are trying to increase detention space and working with governments in the region.

The officials are appearing before the Senate Homeland Security and Governmental Affairs Committee a day after Obama asked Congress for $3.7 billion to deal with the crisis. The hearing was not called to focus on that request, but questions on it were expected.