"We've seen an absolutely unbelievable drop in the number of migrants coming out of Central America", Kelly said, who noted a "dramatic reduction" in the number of women and children trying to make that crossing.
The children were turned over to the woman's mother.
With Trump's wall planned for the entire border, some of his supporters are now saying they will fight his administration in the courts.
Gonzalez said he left El Salvador because he feared the gangs and the constant threat of being robbed or attacked.
Kelly said he's been given "elbow room" by the president to execute the border as he sees fit and the wall could be combination of fencing, surveillance and technology.
News of the dramatic decrease in arrests comes on the same day that proposals for Trump's border wall were due to the government.
"Physical barriers work", Kelly said.
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Just five people were eating dinner on a recent weeknight at a Texas church that is a stopping point for newly arrived immigrants on the U.S. -Mexico border.
U.S. Customs and Border Protection said in a statement that it would pick multiple contractors to build prototypes by around June 1 and will name only the winning bidders.
One bidder wants to build President Donald Trump's 2,000-mile wall with impenetrable concrete made from the soil found on the Mexican border.
Sen. Claire McCaskill, Missouri Democrat, said Mr. Trump's brash assertion of a complete border wall has soured Congress on the plans, and she said if the president would acknowledge Mr. Kelly's lower target, it would improve the debate. During the presidential campaign, Trump insisted that Mexico would pay for the wall.
"The greatest impact in raising the morale in the last 90 days is the work force is now allowed to do their job", the former general said. At the time, a full 442 lawsuits were filed by the United States government against American property owners, who were either trying to keep their land or get more money for it. CNN's investigation found that most of those landowners lost their court battle, and 93 of them are still going.
Kelly reported the figures in written testimony submitted to a Senate committee ahead of an appearance Wednesday. To justify the request for additional federal funds for southern border security, Kelly highlighted early successes, thus far.
Kelly said that decline in the number of people trying to enter the United States illegally won't continue unless his agency gets the resources needed to secure the border.
According to Kelly's original testimony provided to Fox News, there has been a sharp decline in apprehensions along the southwest border since the beginning of the year, with March marking the fifth straight month of decline, apprehending 17,000 individuals attempting to enter the USA illegally. Clare McCaskill (D-MO).