Migrants in Mexico who were hoping to come to the U.S. are adjusting to a new and uncertain reality after President Donald Trump began cracking down on border security.

Several migrants said they had recently arrived in Ciudad Juarez, Mexico after weeks of travel, only to find their CBP One appointments were cancelled.

Some residents and business leaders in the Mexican border city of Ciudad Juarez have reacted to threats by U.S. President Donald Trump of tariffs on Mexican imports. (AP/ Martín Silva Rey)

The temporary shelters in Ciudad Juarez will have the capacity to house thousands of people and should be ready in a matter of days, said municipal

Mexican authorities are building temporary shelters in Ciudad Juarez and other cities to prepare to receive nationals deported from the U.S. by President Donald Trump.

The US-Mexico border is effectively closed off to migrants seeking asylum in the United States within hours of President Donald Trump taking office, an extraordinary departure from previous protocols that has left many concerned migrants in limbo.

The Trump administration has ended use of the border app called CBP One that allowed nearly 1 million people to legally enter the United States.

Hours after Trump’s inauguration, his administration canceled appointments allowing migrants to enter the U.S. to request asylum, leaving many of them stranded on the U.S.-Mexico border.

A secret tunnel discovered last week on the U.S.-Mexico border will be sealed by Mexican authorities, an army official in Ciudad Juarez said Saturday.

The CBP One app has been highly popular, functioning as an online lottery system that grants appointments to 1,450 people daily at eight border crossings. These individuals enter the U.S. under immigration "parole," a presidential authority that Joe Biden has exercised more frequently than any other president since its creation in 1952.

Mexico erected sprawling tents on the United States border as it braced for the effects of Donald Trump’s mass deportation drive. In an empty lot in Ciudad Juarez, which neighbours Texas, cranes lifted metal frames for tent shelters.