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.

President Trump pulled the plug on CBP One app leaving many migrants, many waiting for months in Mexico, finding new ways to seek asylum.

Mexico City's makeshift migrant camp was full of uncertainty on Monday after the Trump administration ended a Biden-era border app that gave legal entry to nearly 1 million people. (AP/ Fernanda Pesce

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

On the day of President Donald Trump's inauguration, the government application CBP One, which migrants used to submit legal visa applications, ceased functioning. The CBP One application was introduced by Joe Biden's administration to reduce illegal crossings of the Mexico-U.

Donald Trump becomes the 47th US President as he assumes the Oval Office on Jan 20 with a grand inauguration. While all eyes were on the inauguration, the situation at the Mexican Border depicted a whole different story.