"It is one of the saddest days of my life, because I suffered a lot to get here," says 33-year-old Colombian Francisco Tordecilla at the Mexico-US border in Tijuana, after his asylum appointment was canceled as part of a sweeping immigration crackdown announced by US President Donald Trump on his first day in office. Minutes after he was sworn in, the CBP One app, introduced by Trump's predecessor Joe Biden to help process applications to enter the United States, went offline. IMAGES AND SOUNDBITES