Hundreds of migrants from Africa and elsewhere are using a loophole in Nicaraguan immigration law to make their way to the United States 

DailyMail.com traveled to Lukeville, Arizona, and saw at least 600 migrants, many of them African refugees, crossing the southern border on one day alone

Baba, a mechanic from the West African nation of Mauritania threw himself to the ground and prayed seconds after squeezing through the steel fence at the Mexican border in Arizona. 

'Joe Biden opened the door for us,' he gleefully yelled as dusk fell and the migrants waited to be picked up and processed by U.S. authorities.

'I wanted to come here to be free. You cannot put a price on freedom,' added Baba, one of an increasing number of migrants from several African countries who are now joining the influx along the southern border.

But while Baba, 25, thanked Biden's border control policies for the chance of a new life in America, there is really one other person he should be showing his gratitude to.

That man is Daniel Ortega, the 77-year-old long-time strongman in Nicaragua, a close ally of the late Cuban dictator Fidel Castro and an implacable foe of the United States which has imposed sanctions on his country.