Mr Kalanick defended his participation on Trump's panel in his Saturday Facebook post, saying he joined Mr Trump's advisory board out of the "belief that by speaking up and engaging we can make a difference." Mr Kalanick has also said that he would "urge the government to reinstate the right of U.S. residents to travel — whatever their country of origin — immediately".
Still, many people are posting under the hashtag #DeleteUber in protest at the app. But just deleting the app isn't enough. If users really want to delete Uber then they have to delete themselves from the app, too – which is slightly more complicated.
The controversial orders Donald Trump has already issued
Once it's deleted, there are more alternatives that can be used in the US than elsewhere, such as in the UK.
In the US, for instance, rival taxi app Lyft has said that it will donate $1 million over the next four years to the American Civil Liberties Union. That was the organisation that successfully requested an emergency order approved by a federal judge Saturday that temporarily bars the U.S. from deporting people from the countries subject to Mr Trump's travel ban.
A smaller app called Juno is only available in New York. It offers cheaper rides and claims to treat drivers better than Uber.
In the UK, options include Gett, an app that lets people call up more traditional taxis. That offers free rides to users when they sign up.
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