Travis Kalanick's announcement comes a week after Uber users boycotted the hailing service.
Mexico and the United States have enjoyed an amicable relationship, but Trump's presidency and his continued efforts to make Mexico pay for the wall, risks their alliance.
Invoking Martin Luther King Jr., the president said the country needs to possess a "fierce urgency of now" to combat gun violence and not only discuss the latest mass shooting, but prevent it.
