How do we know that Trump donated his presidential salary to charity?

San Francisco CA

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Do we know this to be fact? What charities benefitted from the donations? Since Trump hides his tax returns, we may never know? Has any charity openly thanked Trump for his donation? Typically I give people the benefit of the doubt, but you can see why I am reluctant ot believe the man known ad the worlds biggest liar. You can see why I question the actions of the worlds greatest con man. The president of the United States earns 400k annually. Who/what charity received 1 million dollars (after taxes) in donations from Trump.