During a meeting with the Polish prime minister, Mr. Trump also singled out acting Homeland Security Secretary Kevin McAleenan, wondering why he was at the White House rather than down on the border overseeing efforts.
Mexican officials said that the deployment of National Guard Forces to its southern border it shares with Guatemala will begin on June 12 and is expected to advance quickly.
Trump rightly said that was not good enough at a time when over 4,600 migrants were apprehended crossing the border each day in May.
The agreement which was signed on Friday, June 7, also requires the Mexican government to expand the initiative to return asylum seekers from the US border to Mexico while they wait for their claims to be processed.
He has asked Congress for an emergency infusion of $4.5 billion to provide better care for the children and families surging at the border.More news: U.S. players criticised for excessive goal celebrations after thrashing Thailand 13-0
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After three days of negotiations, the United States and Mexico reached an agreement that would see an expanded implementation of the Migrant Protection Protocols (MPP), commonly known as the "Remain in Mexico" policy and increased security at the southern border.
That's become a free pass to enter the USA, with more than 60 percent of the illegal traffic last month made up of families. The United States and Canada have a "safe third country" agreement under which those seeking asylum must make their claim in the country where they first arrive.
The Wall Street Journal reported that Mexico has promised that if it can't adequately stem the tide of migrants flowing to the north, it will agree to implement a "regional" system that requires Central Americans to apply for asylum in the first "safe" country they enter.
Trump on Wednesday chided the USA for having "the worst immigration laws, the dumbest laws anywhere in the world", while adding that Mexico's immigration laws were "as strong as they can be".
Indeed, the paper appeared to confirm that Mexico would deploy 6,000 National Guardsmen on its southern border with Guatemala, as well as expanding its approach to taking back asylum-seekers as Washington processes their claims. "But very happy with the deal I made, if Mexico produces (which I think they will)".
Mexico has so far rejected plans to be designated a safe third country if this plan fails.
The President tweeted Monday, saying tariffs will be reinstated if Mexico's legislature doesn't vote to approve the deal.